1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 7 * Copyright(c) 2018 - 2019 Intel Corporation 8 * 9 * Contact Information: 10 * Intel Linux Wireless <linuxwifi@intel.com> 11 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 12 * 13 *****************************************************************************/ 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/slab.h> 17 #include <net/mac80211.h> 18 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/delay.h> 22 23 #include <linux/workqueue.h> 24 #include "rs.h" 25 #include "fw-api.h" 26 #include "sta.h" 27 #include "iwl-op-mode.h" 28 #include "mvm.h" 29 #include "debugfs.h" 30 31 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 32 33 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 34 * Use this macro when dealing with thresholds consts set as a percentage 35 */ 36 #define RS_PERCENT(x) (128 * x) 37 38 static u8 rs_ht_to_legacy[] = { 39 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 40 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 41 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 42 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 43 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 44 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 45 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 46 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 47 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 48 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 49 }; 50 51 static const u8 ant_toggle_lookup[] = { 52 [ANT_NONE] = ANT_NONE, 53 [ANT_A] = ANT_B, 54 [ANT_B] = ANT_A, 55 [ANT_AB] = ANT_AB, 56 }; 57 58 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 59 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 60 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 61 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 62 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 63 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 64 IWL_RATE_##rp##M_INDEX, \ 65 IWL_RATE_##rn##M_INDEX } 66 67 #define IWL_DECLARE_MCS_RATE(s) \ 68 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 69 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 70 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 71 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 72 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 73 IWL_RATE_INVM_INDEX, \ 74 IWL_RATE_INVM_INDEX } 75 76 /* 77 * Parameter order: 78 * rate, ht rate, prev rate, next rate 79 * 80 * If there isn't a valid next or previous rate then INV is used which 81 * maps to IWL_RATE_INVALID 82 * 83 */ 84 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 85 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 86 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 87 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 88 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 89 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 90 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 91 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 92 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 93 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 94 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 95 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 96 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 97 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 98 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 99 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 100 }; 101 102 enum rs_action { 103 RS_ACTION_STAY = 0, 104 RS_ACTION_DOWNSCALE = -1, 105 RS_ACTION_UPSCALE = 1, 106 }; 107 108 enum rs_column_mode { 109 RS_INVALID = 0, 110 RS_LEGACY, 111 RS_SISO, 112 RS_MIMO2, 113 }; 114 115 #define MAX_NEXT_COLUMNS 7 116 #define MAX_COLUMN_CHECKS 3 117 118 struct rs_tx_column; 119 120 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 121 struct ieee80211_sta *sta, 122 struct rs_rate *rate, 123 const struct rs_tx_column *next_col); 124 125 struct rs_tx_column { 126 enum rs_column_mode mode; 127 u8 ant; 128 bool sgi; 129 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 130 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 131 }; 132 133 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 134 struct rs_rate *rate, 135 const struct rs_tx_column *next_col) 136 { 137 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 138 } 139 140 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 141 struct rs_rate *rate, 142 const struct rs_tx_column *next_col) 143 { 144 if (!sta->ht_cap.ht_supported) 145 return false; 146 147 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 148 return false; 149 150 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 151 return false; 152 153 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 154 return false; 155 156 if (mvm->nvm_data->sku_cap_mimo_disabled) 157 return false; 158 159 return true; 160 } 161 162 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 163 struct rs_rate *rate, 164 const struct rs_tx_column *next_col) 165 { 166 if (!sta->ht_cap.ht_supported) 167 return false; 168 169 return true; 170 } 171 172 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 173 struct rs_rate *rate, 174 const struct rs_tx_column *next_col) 175 { 176 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 177 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 178 179 if (is_ht20(rate) && (ht_cap->cap & 180 IEEE80211_HT_CAP_SGI_20)) 181 return true; 182 if (is_ht40(rate) && (ht_cap->cap & 183 IEEE80211_HT_CAP_SGI_40)) 184 return true; 185 if (is_ht80(rate) && (vht_cap->cap & 186 IEEE80211_VHT_CAP_SHORT_GI_80)) 187 return true; 188 if (is_ht160(rate) && (vht_cap->cap & 189 IEEE80211_VHT_CAP_SHORT_GI_160)) 190 return true; 191 192 return false; 193 } 194 195 static const struct rs_tx_column rs_tx_columns[] = { 196 [RS_COLUMN_LEGACY_ANT_A] = { 197 .mode = RS_LEGACY, 198 .ant = ANT_A, 199 .next_columns = { 200 RS_COLUMN_LEGACY_ANT_B, 201 RS_COLUMN_SISO_ANT_A, 202 RS_COLUMN_MIMO2, 203 RS_COLUMN_INVALID, 204 RS_COLUMN_INVALID, 205 RS_COLUMN_INVALID, 206 RS_COLUMN_INVALID, 207 }, 208 .checks = { 209 rs_ant_allow, 210 }, 211 }, 212 [RS_COLUMN_LEGACY_ANT_B] = { 213 .mode = RS_LEGACY, 214 .ant = ANT_B, 215 .next_columns = { 216 RS_COLUMN_LEGACY_ANT_A, 217 RS_COLUMN_SISO_ANT_B, 218 RS_COLUMN_MIMO2, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 RS_COLUMN_INVALID, 222 RS_COLUMN_INVALID, 223 }, 224 .checks = { 225 rs_ant_allow, 226 }, 227 }, 228 [RS_COLUMN_SISO_ANT_A] = { 229 .mode = RS_SISO, 230 .ant = ANT_A, 231 .next_columns = { 232 RS_COLUMN_SISO_ANT_B, 233 RS_COLUMN_MIMO2, 234 RS_COLUMN_SISO_ANT_A_SGI, 235 RS_COLUMN_LEGACY_ANT_A, 236 RS_COLUMN_LEGACY_ANT_B, 237 RS_COLUMN_INVALID, 238 RS_COLUMN_INVALID, 239 }, 240 .checks = { 241 rs_siso_allow, 242 rs_ant_allow, 243 }, 244 }, 245 [RS_COLUMN_SISO_ANT_B] = { 246 .mode = RS_SISO, 247 .ant = ANT_B, 248 .next_columns = { 249 RS_COLUMN_SISO_ANT_A, 250 RS_COLUMN_MIMO2, 251 RS_COLUMN_SISO_ANT_B_SGI, 252 RS_COLUMN_LEGACY_ANT_A, 253 RS_COLUMN_LEGACY_ANT_B, 254 RS_COLUMN_INVALID, 255 RS_COLUMN_INVALID, 256 }, 257 .checks = { 258 rs_siso_allow, 259 rs_ant_allow, 260 }, 261 }, 262 [RS_COLUMN_SISO_ANT_A_SGI] = { 263 .mode = RS_SISO, 264 .ant = ANT_A, 265 .sgi = true, 266 .next_columns = { 267 RS_COLUMN_SISO_ANT_B_SGI, 268 RS_COLUMN_MIMO2_SGI, 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_LEGACY_ANT_A, 271 RS_COLUMN_LEGACY_ANT_B, 272 RS_COLUMN_INVALID, 273 RS_COLUMN_INVALID, 274 }, 275 .checks = { 276 rs_siso_allow, 277 rs_ant_allow, 278 rs_sgi_allow, 279 }, 280 }, 281 [RS_COLUMN_SISO_ANT_B_SGI] = { 282 .mode = RS_SISO, 283 .ant = ANT_B, 284 .sgi = true, 285 .next_columns = { 286 RS_COLUMN_SISO_ANT_A_SGI, 287 RS_COLUMN_MIMO2_SGI, 288 RS_COLUMN_SISO_ANT_B, 289 RS_COLUMN_LEGACY_ANT_A, 290 RS_COLUMN_LEGACY_ANT_B, 291 RS_COLUMN_INVALID, 292 RS_COLUMN_INVALID, 293 }, 294 .checks = { 295 rs_siso_allow, 296 rs_ant_allow, 297 rs_sgi_allow, 298 }, 299 }, 300 [RS_COLUMN_MIMO2] = { 301 .mode = RS_MIMO2, 302 .ant = ANT_AB, 303 .next_columns = { 304 RS_COLUMN_SISO_ANT_A, 305 RS_COLUMN_MIMO2_SGI, 306 RS_COLUMN_LEGACY_ANT_A, 307 RS_COLUMN_LEGACY_ANT_B, 308 RS_COLUMN_INVALID, 309 RS_COLUMN_INVALID, 310 RS_COLUMN_INVALID, 311 }, 312 .checks = { 313 rs_mimo_allow, 314 }, 315 }, 316 [RS_COLUMN_MIMO2_SGI] = { 317 .mode = RS_MIMO2, 318 .ant = ANT_AB, 319 .sgi = true, 320 .next_columns = { 321 RS_COLUMN_SISO_ANT_A_SGI, 322 RS_COLUMN_MIMO2, 323 RS_COLUMN_LEGACY_ANT_A, 324 RS_COLUMN_LEGACY_ANT_B, 325 RS_COLUMN_INVALID, 326 RS_COLUMN_INVALID, 327 RS_COLUMN_INVALID, 328 }, 329 .checks = { 330 rs_mimo_allow, 331 rs_sgi_allow, 332 }, 333 }, 334 }; 335 336 static inline u8 rs_extract_rate(u32 rate_n_flags) 337 { 338 /* also works for HT because bits 7:6 are zero there */ 339 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 340 } 341 342 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 343 { 344 int idx = 0; 345 346 if (rate_n_flags & RATE_MCS_HT_MSK) { 347 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 348 idx += IWL_RATE_MCS_0_INDEX; 349 350 /* skip 9M not supported in HT*/ 351 if (idx >= IWL_RATE_9M_INDEX) 352 idx += 1; 353 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 354 return idx; 355 } else if (rate_n_flags & RATE_MCS_VHT_MSK || 356 rate_n_flags & RATE_MCS_HE_MSK) { 357 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 358 idx += IWL_RATE_MCS_0_INDEX; 359 360 /* skip 9M not supported in VHT*/ 361 if (idx >= IWL_RATE_9M_INDEX) 362 idx++; 363 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 364 return idx; 365 if ((rate_n_flags & RATE_MCS_HE_MSK) && 366 (idx <= IWL_LAST_HE_RATE)) 367 return idx; 368 } else { 369 /* legacy rate format, search for match in table */ 370 371 u8 legacy_rate = rs_extract_rate(rate_n_flags); 372 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 373 if (iwl_rates[idx].plcp == legacy_rate) 374 return idx; 375 } 376 377 return IWL_RATE_INVALID; 378 } 379 380 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 381 struct ieee80211_sta *sta, 382 struct iwl_lq_sta *lq_sta, 383 int tid, bool ndp); 384 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 385 struct ieee80211_sta *sta, 386 struct iwl_lq_sta *lq_sta, 387 const struct rs_rate *initial_rate); 388 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 389 390 /** 391 * The following tables contain the expected throughput metrics for all rates 392 * 393 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 394 * 395 * where invalid entries are zeros. 396 * 397 * CCK rates are only valid in legacy table and will only be used in G 398 * (2.4 GHz) band. 399 */ 400 401 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 402 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 403 }; 404 405 /* Expected TpT tables. 4 indexes: 406 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 407 */ 408 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 409 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 410 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 411 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 412 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 413 }; 414 415 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 416 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 417 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 418 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 419 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 420 }; 421 422 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 423 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 424 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 425 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 426 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 427 }; 428 429 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 430 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 431 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 432 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 433 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 434 }; 435 436 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 437 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 438 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 439 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 440 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 441 }; 442 443 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 444 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 445 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 446 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 447 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 448 }; 449 450 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 451 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 452 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 453 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 454 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 455 }; 456 457 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 458 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 459 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 460 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 461 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 462 }; 463 464 /* mbps, mcs */ 465 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 466 { "1", "BPSK DSSS"}, 467 { "2", "QPSK DSSS"}, 468 {"5.5", "BPSK CCK"}, 469 { "11", "QPSK CCK"}, 470 { "6", "BPSK 1/2"}, 471 { "9", "BPSK 1/2"}, 472 { "12", "QPSK 1/2"}, 473 { "18", "QPSK 3/4"}, 474 { "24", "16QAM 1/2"}, 475 { "36", "16QAM 3/4"}, 476 { "48", "64QAM 2/3"}, 477 { "54", "64QAM 3/4"}, 478 { "60", "64QAM 5/6"}, 479 }; 480 481 #define MCS_INDEX_PER_STREAM (8) 482 483 static const char *rs_pretty_ant(u8 ant) 484 { 485 static const char * const ant_name[] = { 486 [ANT_NONE] = "None", 487 [ANT_A] = "A", 488 [ANT_B] = "B", 489 [ANT_AB] = "AB", 490 [ANT_C] = "C", 491 [ANT_AC] = "AC", 492 [ANT_BC] = "BC", 493 [ANT_ABC] = "ABC", 494 }; 495 496 if (ant > ANT_ABC) 497 return "UNKNOWN"; 498 499 return ant_name[ant]; 500 } 501 502 static const char *rs_pretty_lq_type(enum iwl_table_type type) 503 { 504 static const char * const lq_types[] = { 505 [LQ_NONE] = "NONE", 506 [LQ_LEGACY_A] = "LEGACY_A", 507 [LQ_LEGACY_G] = "LEGACY_G", 508 [LQ_HT_SISO] = "HT SISO", 509 [LQ_HT_MIMO2] = "HT MIMO", 510 [LQ_VHT_SISO] = "VHT SISO", 511 [LQ_VHT_MIMO2] = "VHT MIMO", 512 [LQ_HE_SISO] = "HE SISO", 513 [LQ_HE_MIMO2] = "HE MIMO", 514 }; 515 516 if (type < LQ_NONE || type >= LQ_MAX) 517 return "UNKNOWN"; 518 519 return lq_types[type]; 520 } 521 522 static char *rs_pretty_rate(const struct rs_rate *rate) 523 { 524 static char buf[40]; 525 static const char * const legacy_rates[] = { 526 [IWL_RATE_1M_INDEX] = "1M", 527 [IWL_RATE_2M_INDEX] = "2M", 528 [IWL_RATE_5M_INDEX] = "5.5M", 529 [IWL_RATE_11M_INDEX] = "11M", 530 [IWL_RATE_6M_INDEX] = "6M", 531 [IWL_RATE_9M_INDEX] = "9M", 532 [IWL_RATE_12M_INDEX] = "12M", 533 [IWL_RATE_18M_INDEX] = "18M", 534 [IWL_RATE_24M_INDEX] = "24M", 535 [IWL_RATE_36M_INDEX] = "36M", 536 [IWL_RATE_48M_INDEX] = "48M", 537 [IWL_RATE_54M_INDEX] = "54M", 538 }; 539 static const char *const ht_vht_rates[] = { 540 [IWL_RATE_MCS_0_INDEX] = "MCS0", 541 [IWL_RATE_MCS_1_INDEX] = "MCS1", 542 [IWL_RATE_MCS_2_INDEX] = "MCS2", 543 [IWL_RATE_MCS_3_INDEX] = "MCS3", 544 [IWL_RATE_MCS_4_INDEX] = "MCS4", 545 [IWL_RATE_MCS_5_INDEX] = "MCS5", 546 [IWL_RATE_MCS_6_INDEX] = "MCS6", 547 [IWL_RATE_MCS_7_INDEX] = "MCS7", 548 [IWL_RATE_MCS_8_INDEX] = "MCS8", 549 [IWL_RATE_MCS_9_INDEX] = "MCS9", 550 }; 551 const char *rate_str; 552 553 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 554 rate_str = legacy_rates[rate->index]; 555 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 556 (rate->index >= IWL_RATE_MCS_0_INDEX) && 557 (rate->index <= IWL_RATE_MCS_9_INDEX)) 558 rate_str = ht_vht_rates[rate->index]; 559 else 560 rate_str = "BAD_RATE"; 561 562 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 563 rs_pretty_ant(rate->ant), rate_str); 564 return buf; 565 } 566 567 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 568 const char *prefix) 569 { 570 IWL_DEBUG_RATE(mvm, 571 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 572 prefix, rs_pretty_rate(rate), rate->bw, 573 rate->sgi, rate->ldpc, rate->stbc); 574 } 575 576 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 577 { 578 window->data = 0; 579 window->success_counter = 0; 580 window->success_ratio = IWL_INVALID_VALUE; 581 window->counter = 0; 582 window->average_tpt = IWL_INVALID_VALUE; 583 } 584 585 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 586 struct iwl_scale_tbl_info *tbl) 587 { 588 int i; 589 590 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 591 for (i = 0; i < IWL_RATE_COUNT; i++) 592 rs_rate_scale_clear_window(&tbl->win[i]); 593 594 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 595 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 596 } 597 598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 599 { 600 return (ant_type & valid_antenna) == ant_type; 601 } 602 603 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 604 struct iwl_lq_sta *lq_data, u8 tid, 605 struct ieee80211_sta *sta) 606 { 607 int ret = -EAGAIN; 608 609 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 610 sta->addr, tid); 611 612 /* start BA session until the peer sends del BA */ 613 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 614 if (ret == -EAGAIN) { 615 /* 616 * driver and mac80211 is out of sync 617 * this might be cause by reloading firmware 618 * stop the tx ba session here 619 */ 620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 621 tid); 622 ieee80211_stop_tx_ba_session(sta, tid); 623 } 624 return ret; 625 } 626 627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 628 u8 tid, struct iwl_lq_sta *lq_sta, 629 struct ieee80211_sta *sta) 630 { 631 struct iwl_mvm_tid_data *tid_data; 632 633 /* 634 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 635 * when the frame is not QoS 636 */ 637 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 638 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 639 tid, IWL_MAX_TID_COUNT); 640 return; 641 } else if (tid == IWL_MAX_TID_COUNT) { 642 return; 643 } 644 645 tid_data = &mvmsta->tid_data[tid]; 646 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 647 tid_data->state == IWL_AGG_OFF && 648 (lq_sta->tx_agg_tid_en & BIT(tid)) && 649 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 650 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 651 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 652 tid_data->state = IWL_AGG_QUEUED; 653 } 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 void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 763 struct iwl_mvm_sta *mvmsta, 764 u8 tid, int successes) 765 { 766 struct iwl_mvm_tid_data *tid_data; 767 768 if (tid >= IWL_MAX_TID_COUNT) 769 return; 770 771 tid_data = &mvmsta->tid_data[tid]; 772 773 /* 774 * Measure if there're enough successful transmits per second. 775 * These statistics are used only to decide if we can start a 776 * BA session, so it should be updated only when A-MPDU is 777 * off. 778 */ 779 if (tid_data->state != IWL_AGG_OFF) 780 return; 781 782 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 783 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 784 tid_data->tx_count_last = tid_data->tx_count; 785 tid_data->tx_count = 0; 786 tid_data->tpt_meas_start = jiffies; 787 } else { 788 tid_data->tx_count += successes; 789 } 790 } 791 792 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 793 struct iwl_mvm_sta *mvmsta, u8 tid, 794 struct iwl_scale_tbl_info *tbl, 795 int scale_index, int attempts, int successes) 796 { 797 struct iwl_rate_scale_data *window = NULL; 798 799 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 800 return -EINVAL; 801 802 if (tbl->column != RS_COLUMN_INVALID) { 803 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 804 805 pers->tx_stats[tbl->column][scale_index].total += attempts; 806 pers->tx_stats[tbl->column][scale_index].success += successes; 807 } 808 809 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 810 811 /* Select window for current tx bit rate */ 812 window = &(tbl->win[scale_index]); 813 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 814 window); 815 } 816 817 /* Convert rs_rate object into ucode rate bitmask */ 818 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 819 struct rs_rate *rate) 820 { 821 u32 ucode_rate = 0; 822 int index = rate->index; 823 824 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 825 RATE_MCS_ANT_ABC_MSK); 826 827 if (is_legacy(rate)) { 828 ucode_rate |= iwl_rates[index].plcp; 829 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 830 ucode_rate |= RATE_MCS_CCK_MSK; 831 return ucode_rate; 832 } 833 834 if (is_ht(rate)) { 835 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 836 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 837 index = IWL_LAST_HT_RATE; 838 } 839 ucode_rate |= RATE_MCS_HT_MSK; 840 841 if (is_ht_siso(rate)) 842 ucode_rate |= iwl_rates[index].plcp_ht_siso; 843 else if (is_ht_mimo2(rate)) 844 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 845 else 846 WARN_ON_ONCE(1); 847 } else if (is_vht(rate)) { 848 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 849 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 850 index = IWL_LAST_VHT_RATE; 851 } 852 ucode_rate |= RATE_MCS_VHT_MSK; 853 if (is_vht_siso(rate)) 854 ucode_rate |= iwl_rates[index].plcp_vht_siso; 855 else if (is_vht_mimo2(rate)) 856 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 857 else 858 WARN_ON_ONCE(1); 859 860 } else { 861 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 862 } 863 864 if (is_siso(rate) && rate->stbc) { 865 /* To enable STBC we need to set both a flag and ANT_AB */ 866 ucode_rate |= RATE_MCS_ANT_AB_MSK; 867 ucode_rate |= RATE_MCS_STBC_MSK; 868 } 869 870 ucode_rate |= rate->bw; 871 if (rate->sgi) 872 ucode_rate |= RATE_MCS_SGI_MSK; 873 if (rate->ldpc) 874 ucode_rate |= RATE_MCS_LDPC_MSK; 875 876 return ucode_rate; 877 } 878 879 /* Convert a ucode rate into an rs_rate object */ 880 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 881 enum nl80211_band band, 882 struct rs_rate *rate) 883 { 884 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 885 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 886 u8 nss; 887 888 memset(rate, 0, sizeof(*rate)); 889 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 890 891 if (rate->index == IWL_RATE_INVALID) 892 return -EINVAL; 893 894 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 895 896 /* Legacy */ 897 if (!(ucode_rate & RATE_MCS_HT_MSK) && 898 !(ucode_rate & RATE_MCS_VHT_MSK) && 899 !(ucode_rate & RATE_MCS_HE_MSK)) { 900 if (num_of_ant == 1) { 901 if (band == NL80211_BAND_5GHZ) 902 rate->type = LQ_LEGACY_A; 903 else 904 rate->type = LQ_LEGACY_G; 905 } 906 907 return 0; 908 } 909 910 /* HT, VHT or HE */ 911 if (ucode_rate & RATE_MCS_SGI_MSK) 912 rate->sgi = true; 913 if (ucode_rate & RATE_MCS_LDPC_MSK) 914 rate->ldpc = true; 915 if (ucode_rate & RATE_MCS_STBC_MSK) 916 rate->stbc = true; 917 if (ucode_rate & RATE_MCS_BF_MSK) 918 rate->bfer = true; 919 920 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 921 922 if (ucode_rate & RATE_MCS_HT_MSK) { 923 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 924 RATE_HT_MCS_NSS_POS) + 1; 925 926 if (nss == 1) { 927 rate->type = LQ_HT_SISO; 928 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 929 "stbc %d bfer %d", 930 rate->stbc, rate->bfer); 931 } else if (nss == 2) { 932 rate->type = LQ_HT_MIMO2; 933 WARN_ON_ONCE(num_of_ant != 2); 934 } else { 935 WARN_ON_ONCE(1); 936 } 937 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 938 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 939 RATE_VHT_MCS_NSS_POS) + 1; 940 941 if (nss == 1) { 942 rate->type = LQ_VHT_SISO; 943 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 944 "stbc %d bfer %d", 945 rate->stbc, rate->bfer); 946 } else if (nss == 2) { 947 rate->type = LQ_VHT_MIMO2; 948 WARN_ON_ONCE(num_of_ant != 2); 949 } else { 950 WARN_ON_ONCE(1); 951 } 952 } else if (ucode_rate & RATE_MCS_HE_MSK) { 953 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 954 RATE_VHT_MCS_NSS_POS) + 1; 955 956 if (nss == 1) { 957 rate->type = LQ_HE_SISO; 958 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 959 "stbc %d bfer %d", rate->stbc, rate->bfer); 960 } else if (nss == 2) { 961 rate->type = LQ_HE_MIMO2; 962 WARN_ON_ONCE(num_of_ant != 2); 963 } else { 964 WARN_ON_ONCE(1); 965 } 966 } 967 968 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 969 !is_he(rate) && !is_vht(rate)); 970 971 return 0; 972 } 973 974 /* switch to another antenna/antennas and return 1 */ 975 /* if no other valid antenna found, return 0 */ 976 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 977 { 978 u8 new_ant_type; 979 980 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 981 return 0; 982 983 if (!rs_is_valid_ant(valid_ant, rate->ant)) 984 return 0; 985 986 new_ant_type = ant_toggle_lookup[rate->ant]; 987 988 while ((new_ant_type != rate->ant) && 989 !rs_is_valid_ant(valid_ant, new_ant_type)) 990 new_ant_type = ant_toggle_lookup[new_ant_type]; 991 992 if (new_ant_type == rate->ant) 993 return 0; 994 995 rate->ant = new_ant_type; 996 997 return 1; 998 } 999 1000 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 1001 struct rs_rate *rate) 1002 { 1003 if (is_legacy(rate)) 1004 return lq_sta->active_legacy_rate; 1005 else if (is_siso(rate)) 1006 return lq_sta->active_siso_rate; 1007 else if (is_mimo2(rate)) 1008 return lq_sta->active_mimo2_rate; 1009 1010 WARN_ON_ONCE(1); 1011 return 0; 1012 } 1013 1014 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1015 int rate_type) 1016 { 1017 u8 high = IWL_RATE_INVALID; 1018 u8 low = IWL_RATE_INVALID; 1019 1020 /* 802.11A or ht walks to the next literal adjacent rate in 1021 * the rate table */ 1022 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1023 int i; 1024 u32 mask; 1025 1026 /* Find the previous rate that is in the rate mask */ 1027 i = index - 1; 1028 if (i >= 0) 1029 mask = BIT(i); 1030 for (; i >= 0; i--, mask >>= 1) { 1031 if (rate_mask & mask) { 1032 low = i; 1033 break; 1034 } 1035 } 1036 1037 /* Find the next rate that is in the rate mask */ 1038 i = index + 1; 1039 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1040 if (rate_mask & mask) { 1041 high = i; 1042 break; 1043 } 1044 } 1045 1046 return (high << 8) | low; 1047 } 1048 1049 low = index; 1050 while (low != IWL_RATE_INVALID) { 1051 low = iwl_rates[low].prev_rs; 1052 if (low == IWL_RATE_INVALID) 1053 break; 1054 if (rate_mask & (1 << low)) 1055 break; 1056 } 1057 1058 high = index; 1059 while (high != IWL_RATE_INVALID) { 1060 high = iwl_rates[high].next_rs; 1061 if (high == IWL_RATE_INVALID) 1062 break; 1063 if (rate_mask & (1 << high)) 1064 break; 1065 } 1066 1067 return (high << 8) | low; 1068 } 1069 1070 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1071 struct rs_rate *rate) 1072 { 1073 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1074 } 1075 1076 /* Get the next supported lower rate in the current column. 1077 * Return true if bottom rate in the current column was reached 1078 */ 1079 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1080 struct rs_rate *rate) 1081 { 1082 u8 low; 1083 u16 high_low; 1084 u16 rate_mask; 1085 struct iwl_mvm *mvm = lq_sta->pers.drv; 1086 1087 rate_mask = rs_get_supported_rates(lq_sta, rate); 1088 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1089 rate->type); 1090 low = high_low & 0xff; 1091 1092 /* Bottom rate of column reached */ 1093 if (low == IWL_RATE_INVALID) 1094 return true; 1095 1096 rate->index = low; 1097 return false; 1098 } 1099 1100 /* Get the next rate to use following a column downgrade */ 1101 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1102 struct rs_rate *rate) 1103 { 1104 struct iwl_mvm *mvm = lq_sta->pers.drv; 1105 1106 if (is_legacy(rate)) { 1107 /* No column to downgrade from Legacy */ 1108 return; 1109 } else if (is_siso(rate)) { 1110 /* Downgrade to Legacy if we were in SISO */ 1111 if (lq_sta->band == NL80211_BAND_5GHZ) 1112 rate->type = LQ_LEGACY_A; 1113 else 1114 rate->type = LQ_LEGACY_G; 1115 1116 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1117 1118 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1119 rate->index > IWL_RATE_MCS_9_INDEX); 1120 1121 rate->index = rs_ht_to_legacy[rate->index]; 1122 rate->ldpc = false; 1123 } else { 1124 /* Downgrade to SISO with same MCS if in MIMO */ 1125 rate->type = is_vht_mimo2(rate) ? 1126 LQ_VHT_SISO : LQ_HT_SISO; 1127 } 1128 1129 if (num_of_ant(rate->ant) > 1) 1130 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1131 1132 /* Relevant in both switching to SISO or Legacy */ 1133 rate->sgi = false; 1134 1135 if (!rs_rate_supported(lq_sta, rate)) 1136 rs_get_lower_rate_in_column(lq_sta, rate); 1137 } 1138 1139 /* Check if both rates share the same column */ 1140 static inline bool rs_rate_column_match(struct rs_rate *a, 1141 struct rs_rate *b) 1142 { 1143 bool ant_match; 1144 1145 if (a->stbc || a->bfer) 1146 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1147 else 1148 ant_match = (a->ant == b->ant); 1149 1150 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1151 && ant_match; 1152 } 1153 1154 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1155 { 1156 if (is_legacy(rate)) { 1157 if (rate->ant == ANT_A) 1158 return RS_COLUMN_LEGACY_ANT_A; 1159 1160 if (rate->ant == ANT_B) 1161 return RS_COLUMN_LEGACY_ANT_B; 1162 1163 goto err; 1164 } 1165 1166 if (is_siso(rate)) { 1167 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1168 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1169 RS_COLUMN_SISO_ANT_A; 1170 1171 if (rate->ant == ANT_B) 1172 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1173 RS_COLUMN_SISO_ANT_B; 1174 1175 goto err; 1176 } 1177 1178 if (is_mimo(rate)) 1179 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1180 1181 err: 1182 return RS_COLUMN_INVALID; 1183 } 1184 1185 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1186 { 1187 u8 tid = IWL_MAX_TID_COUNT; 1188 1189 if (ieee80211_is_data_qos(hdr->frame_control)) { 1190 u8 *qc = ieee80211_get_qos_ctl(hdr); 1191 tid = qc[0] & 0xf; 1192 } 1193 1194 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1195 tid = IWL_MAX_TID_COUNT; 1196 1197 return tid; 1198 } 1199 1200 /* 1201 * mac80211 sends us Tx status 1202 */ 1203 static void rs_drv_mac80211_tx_status(void *mvm_r, 1204 struct ieee80211_supported_band *sband, 1205 struct ieee80211_sta *sta, void *priv_sta, 1206 struct sk_buff *skb) 1207 { 1208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1209 struct iwl_op_mode *op_mode = mvm_r; 1210 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1212 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1213 1214 if (!mvmsta->vif) 1215 return; 1216 1217 if (!ieee80211_is_data(hdr->frame_control) || 1218 info->flags & IEEE80211_TX_CTL_NO_ACK) 1219 return; 1220 1221 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1222 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1223 } 1224 1225 /* 1226 * Begin a period of staying with a selected modulation mode. 1227 * Set "stay_in_tbl" flag to prevent any mode switches. 1228 * Set frame tx success limits according to legacy vs. high-throughput, 1229 * and reset overall (spanning all rates) tx success history statistics. 1230 * These control how long we stay using same modulation mode before 1231 * searching for a new mode. 1232 */ 1233 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1234 struct iwl_lq_sta *lq_sta) 1235 { 1236 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1237 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1238 if (is_legacy) { 1239 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1240 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1241 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1242 } else { 1243 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1244 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1245 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1246 } 1247 lq_sta->table_count = 0; 1248 lq_sta->total_failed = 0; 1249 lq_sta->total_success = 0; 1250 lq_sta->flush_timer = jiffies; 1251 lq_sta->visited_columns = 0; 1252 } 1253 1254 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1255 { 1256 if (rate_mask) 1257 return find_last_bit(&rate_mask, BITS_PER_LONG); 1258 return IWL_RATE_INVALID; 1259 } 1260 1261 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1262 const struct rs_tx_column *column) 1263 { 1264 switch (column->mode) { 1265 case RS_LEGACY: 1266 return lq_sta->max_legacy_rate_idx; 1267 case RS_SISO: 1268 return lq_sta->max_siso_rate_idx; 1269 case RS_MIMO2: 1270 return lq_sta->max_mimo2_rate_idx; 1271 default: 1272 WARN_ON_ONCE(1); 1273 } 1274 1275 return lq_sta->max_legacy_rate_idx; 1276 } 1277 1278 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1279 const struct rs_tx_column *column, 1280 u32 bw) 1281 { 1282 /* Used to choose among HT tables */ 1283 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1284 1285 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1286 column->mode != RS_SISO && 1287 column->mode != RS_MIMO2)) 1288 return expected_tpt_legacy; 1289 1290 /* Legacy rates have only one table */ 1291 if (column->mode == RS_LEGACY) 1292 return expected_tpt_legacy; 1293 1294 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1295 /* Choose among many HT tables depending on number of streams 1296 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1297 * status */ 1298 if (column->mode == RS_SISO) { 1299 switch (bw) { 1300 case RATE_MCS_CHAN_WIDTH_20: 1301 ht_tbl_pointer = expected_tpt_siso_20MHz; 1302 break; 1303 case RATE_MCS_CHAN_WIDTH_40: 1304 ht_tbl_pointer = expected_tpt_siso_40MHz; 1305 break; 1306 case RATE_MCS_CHAN_WIDTH_80: 1307 ht_tbl_pointer = expected_tpt_siso_80MHz; 1308 break; 1309 case RATE_MCS_CHAN_WIDTH_160: 1310 ht_tbl_pointer = expected_tpt_siso_160MHz; 1311 break; 1312 default: 1313 WARN_ON_ONCE(1); 1314 } 1315 } else if (column->mode == RS_MIMO2) { 1316 switch (bw) { 1317 case RATE_MCS_CHAN_WIDTH_20: 1318 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1319 break; 1320 case RATE_MCS_CHAN_WIDTH_40: 1321 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1322 break; 1323 case RATE_MCS_CHAN_WIDTH_80: 1324 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1325 break; 1326 case RATE_MCS_CHAN_WIDTH_160: 1327 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1328 break; 1329 default: 1330 WARN_ON_ONCE(1); 1331 } 1332 } else { 1333 WARN_ON_ONCE(1); 1334 } 1335 1336 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1337 return ht_tbl_pointer[0]; 1338 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1339 return ht_tbl_pointer[1]; 1340 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1341 return ht_tbl_pointer[2]; 1342 else /* AGG+SGI */ 1343 return ht_tbl_pointer[3]; 1344 } 1345 1346 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1347 struct iwl_scale_tbl_info *tbl) 1348 { 1349 struct rs_rate *rate = &tbl->rate; 1350 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1351 1352 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1353 } 1354 1355 /* rs uses two tables, one is active and the second is for searching better 1356 * configuration. This function, according to the index of the currently 1357 * active table returns the search table, which is located at the 1358 * index complementary to 1 according to the active table (active = 1, 1359 * search = 0 or active = 0, search = 1). 1360 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds. 1361 */ 1362 static inline u8 rs_search_tbl(u8 active_tbl) 1363 { 1364 return (active_tbl ^ 1) & 1; 1365 } 1366 1367 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1368 struct iwl_lq_sta *lq_sta, 1369 struct iwl_scale_tbl_info *tbl, /* "search" */ 1370 unsigned long rate_mask, s8 index) 1371 { 1372 struct iwl_scale_tbl_info *active_tbl = 1373 &(lq_sta->lq_info[lq_sta->active_tbl]); 1374 s32 success_ratio = active_tbl->win[index].success_ratio; 1375 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1376 const u16 *tpt_tbl = tbl->expected_tpt; 1377 u16 high_low; 1378 u32 target_tpt; 1379 int rate_idx; 1380 1381 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1382 target_tpt = 100 * expected_current_tpt; 1383 IWL_DEBUG_RATE(mvm, 1384 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1385 success_ratio, target_tpt); 1386 } else { 1387 target_tpt = lq_sta->last_tpt; 1388 IWL_DEBUG_RATE(mvm, 1389 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1390 success_ratio, target_tpt); 1391 } 1392 1393 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1394 1395 while (rate_idx != IWL_RATE_INVALID) { 1396 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1397 break; 1398 1399 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1400 tbl->rate.type); 1401 1402 rate_idx = (high_low >> 8) & 0xff; 1403 } 1404 1405 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1406 rate_idx, target_tpt, 1407 rate_idx != IWL_RATE_INVALID ? 1408 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1409 1410 return rate_idx; 1411 } 1412 1413 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1414 { 1415 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1416 struct ieee80211_vht_cap vht_cap = { 1417 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1418 .supp_mcs = sta_vht_cap->vht_mcs, 1419 }; 1420 1421 switch (sta->bandwidth) { 1422 case IEEE80211_STA_RX_BW_160: 1423 /* 1424 * Don't use 160 MHz if VHT extended NSS support 1425 * says we cannot use 2 streams, we don't want to 1426 * deal with this. 1427 * We only check MCS 0 - they will support that if 1428 * we got here at all and we don't care which MCS, 1429 * we want to determine a more global state. 1430 */ 1431 if (ieee80211_get_vht_max_nss(&vht_cap, 1432 IEEE80211_VHT_CHANWIDTH_160MHZ, 1433 0, true) < sta->rx_nss) 1434 return RATE_MCS_CHAN_WIDTH_80; 1435 return RATE_MCS_CHAN_WIDTH_160; 1436 case IEEE80211_STA_RX_BW_80: 1437 return RATE_MCS_CHAN_WIDTH_80; 1438 case IEEE80211_STA_RX_BW_40: 1439 return RATE_MCS_CHAN_WIDTH_40; 1440 case IEEE80211_STA_RX_BW_20: 1441 default: 1442 return RATE_MCS_CHAN_WIDTH_20; 1443 } 1444 } 1445 1446 /* 1447 * Check whether we should continue using same modulation mode, or 1448 * begin search for a new mode, based on: 1449 * 1) # tx successes or failures while using this mode 1450 * 2) # times calling this function 1451 * 3) elapsed time in this mode (not used, for now) 1452 */ 1453 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1454 { 1455 struct iwl_scale_tbl_info *tbl; 1456 int active_tbl; 1457 int flush_interval_passed = 0; 1458 struct iwl_mvm *mvm; 1459 1460 mvm = lq_sta->pers.drv; 1461 active_tbl = lq_sta->active_tbl; 1462 1463 tbl = &(lq_sta->lq_info[active_tbl]); 1464 1465 /* If we've been disallowing search, see if we should now allow it */ 1466 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1467 /* Elapsed time using current modulation mode */ 1468 if (lq_sta->flush_timer) 1469 flush_interval_passed = 1470 time_after(jiffies, 1471 (unsigned long)(lq_sta->flush_timer + 1472 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1473 1474 /* 1475 * Check if we should allow search for new modulation mode. 1476 * If many frames have failed or succeeded, or we've used 1477 * this same modulation for a long time, allow search, and 1478 * reset history stats that keep track of whether we should 1479 * allow a new search. Also (below) reset all bitmaps and 1480 * stats in active history. 1481 */ 1482 if (force_search || 1483 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1484 (lq_sta->total_success > lq_sta->max_success_limit) || 1485 ((!lq_sta->search_better_tbl) && 1486 (lq_sta->flush_timer) && (flush_interval_passed))) { 1487 IWL_DEBUG_RATE(mvm, 1488 "LQ: stay is expired %d %d %d\n", 1489 lq_sta->total_failed, 1490 lq_sta->total_success, 1491 flush_interval_passed); 1492 1493 /* Allow search for new mode */ 1494 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1495 IWL_DEBUG_RATE(mvm, 1496 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1497 lq_sta->total_failed = 0; 1498 lq_sta->total_success = 0; 1499 lq_sta->flush_timer = 0; 1500 /* mark the current column as visited */ 1501 lq_sta->visited_columns = BIT(tbl->column); 1502 /* 1503 * Else if we've used this modulation mode enough repetitions 1504 * (regardless of elapsed time or success/failure), reset 1505 * history bitmaps and rate-specific stats for all rates in 1506 * active table. 1507 */ 1508 } else { 1509 lq_sta->table_count++; 1510 if (lq_sta->table_count >= 1511 lq_sta->table_count_limit) { 1512 lq_sta->table_count = 0; 1513 1514 IWL_DEBUG_RATE(mvm, 1515 "LQ: stay in table clear win\n"); 1516 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1517 } 1518 } 1519 1520 /* If transitioning to allow "search", reset all history 1521 * bitmaps and stats in active table (this will become the new 1522 * "search" table). */ 1523 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1524 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1525 } 1526 } 1527 } 1528 1529 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1530 struct iwl_scale_tbl_info *tbl, 1531 enum rs_action scale_action) 1532 { 1533 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1534 int i; 1535 1536 /* 1537 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1538 * or 0, since there is no per-TID alg. 1539 */ 1540 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1541 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1542 scale_action == RS_ACTION_DOWNSCALE) 1543 mvmsta->amsdu_enabled = 0; 1544 else 1545 mvmsta->amsdu_enabled = 0xFFFF; 1546 1547 if (mvmsta->vif->bss_conf.he_support && 1548 !iwlwifi_mod_params.disable_11ax) 1549 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1550 else 1551 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1552 1553 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1554 1555 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1556 if (mvmsta->amsdu_enabled) 1557 sta->max_tid_amsdu_len[i] = 1558 iwl_mvm_max_amsdu_size(mvm, sta, i); 1559 else 1560 /* 1561 * Not so elegant, but this will effectively 1562 * prevent AMSDU on this TID 1563 */ 1564 sta->max_tid_amsdu_len[i] = 1; 1565 } 1566 } 1567 1568 /* 1569 * setup rate table in uCode 1570 */ 1571 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1572 struct ieee80211_sta *sta, 1573 struct iwl_lq_sta *lq_sta, 1574 struct iwl_scale_tbl_info *tbl) 1575 { 1576 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1577 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 1578 } 1579 1580 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1581 struct ieee80211_sta *sta, 1582 struct iwl_lq_sta *lq_sta, 1583 struct iwl_scale_tbl_info *tbl, 1584 enum rs_action scale_action) 1585 { 1586 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1587 return false; 1588 1589 if (!is_vht_siso(&tbl->rate)) 1590 return false; 1591 1592 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1593 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1594 (scale_action == RS_ACTION_DOWNSCALE)) { 1595 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1596 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1597 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1598 goto tweaked; 1599 } 1600 1601 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1602 * sustainable, i.e. we're past the test window. We can't go back 1603 * if MCS5 is just tested as this will happen always after switching 1604 * to 20Mhz MCS4 because the rate stats are cleared. 1605 */ 1606 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1607 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1608 (scale_action == RS_ACTION_STAY)) || 1609 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1610 (scale_action == RS_ACTION_UPSCALE)))) { 1611 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1612 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1613 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1614 goto tweaked; 1615 } 1616 1617 return false; 1618 1619 tweaked: 1620 rs_set_expected_tpt_table(lq_sta, tbl); 1621 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1622 return true; 1623 } 1624 1625 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1626 struct iwl_lq_sta *lq_sta, 1627 struct ieee80211_sta *sta, 1628 struct iwl_scale_tbl_info *tbl) 1629 { 1630 int i, j, max_rate; 1631 enum rs_column next_col_id; 1632 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1633 const struct rs_tx_column *next_col; 1634 allow_column_func_t allow_func; 1635 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1636 const u16 *expected_tpt_tbl; 1637 u16 tpt, max_expected_tpt; 1638 1639 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1640 next_col_id = curr_col->next_columns[i]; 1641 1642 if (next_col_id == RS_COLUMN_INVALID) 1643 continue; 1644 1645 if (lq_sta->visited_columns & BIT(next_col_id)) { 1646 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1647 next_col_id); 1648 continue; 1649 } 1650 1651 next_col = &rs_tx_columns[next_col_id]; 1652 1653 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1654 IWL_DEBUG_RATE(mvm, 1655 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1656 next_col_id, valid_ants, next_col->ant); 1657 continue; 1658 } 1659 1660 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1661 allow_func = next_col->checks[j]; 1662 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1663 next_col)) 1664 break; 1665 } 1666 1667 if (j != MAX_COLUMN_CHECKS) { 1668 IWL_DEBUG_RATE(mvm, 1669 "Skip column %d: not allowed (check %d failed)\n", 1670 next_col_id, j); 1671 1672 continue; 1673 } 1674 1675 tpt = lq_sta->last_tpt / 100; 1676 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1677 rs_bw_from_sta_bw(sta)); 1678 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1679 continue; 1680 1681 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1682 if (max_rate == IWL_RATE_INVALID) { 1683 IWL_DEBUG_RATE(mvm, 1684 "Skip column %d: no rate is allowed in this column\n", 1685 next_col_id); 1686 continue; 1687 } 1688 1689 max_expected_tpt = expected_tpt_tbl[max_rate]; 1690 if (tpt >= max_expected_tpt) { 1691 IWL_DEBUG_RATE(mvm, 1692 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1693 next_col_id, max_expected_tpt, tpt); 1694 continue; 1695 } 1696 1697 IWL_DEBUG_RATE(mvm, 1698 "Found potential column %d. Max expected %d current %d\n", 1699 next_col_id, max_expected_tpt, tpt); 1700 break; 1701 } 1702 1703 if (i == MAX_NEXT_COLUMNS) 1704 return RS_COLUMN_INVALID; 1705 1706 return next_col_id; 1707 } 1708 1709 static int rs_switch_to_column(struct iwl_mvm *mvm, 1710 struct iwl_lq_sta *lq_sta, 1711 struct ieee80211_sta *sta, 1712 enum rs_column col_id) 1713 { 1714 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 1715 struct iwl_scale_tbl_info *search_tbl = 1716 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 1717 struct rs_rate *rate = &search_tbl->rate; 1718 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1719 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1720 unsigned long rate_mask = 0; 1721 u32 rate_idx = 0; 1722 1723 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1724 1725 rate->sgi = column->sgi; 1726 rate->ant = column->ant; 1727 1728 if (column->mode == RS_LEGACY) { 1729 if (lq_sta->band == NL80211_BAND_5GHZ) 1730 rate->type = LQ_LEGACY_A; 1731 else 1732 rate->type = LQ_LEGACY_G; 1733 1734 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1735 rate->ldpc = false; 1736 rate_mask = lq_sta->active_legacy_rate; 1737 } else if (column->mode == RS_SISO) { 1738 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1739 rate_mask = lq_sta->active_siso_rate; 1740 } else if (column->mode == RS_MIMO2) { 1741 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1742 rate_mask = lq_sta->active_mimo2_rate; 1743 } else { 1744 WARN_ONCE(1, "Bad column mode"); 1745 } 1746 1747 if (column->mode != RS_LEGACY) { 1748 rate->bw = rs_bw_from_sta_bw(sta); 1749 rate->ldpc = lq_sta->ldpc; 1750 } 1751 1752 search_tbl->column = col_id; 1753 rs_set_expected_tpt_table(lq_sta, search_tbl); 1754 1755 lq_sta->visited_columns |= BIT(col_id); 1756 1757 /* Get the best matching rate if we're changing modes. e.g. 1758 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1759 */ 1760 if (curr_column->mode != column->mode) { 1761 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1762 rate_mask, rate->index); 1763 1764 if ((rate_idx == IWL_RATE_INVALID) || 1765 !(BIT(rate_idx) & rate_mask)) { 1766 IWL_DEBUG_RATE(mvm, 1767 "can not switch with index %d" 1768 " rate mask %lx\n", 1769 rate_idx, rate_mask); 1770 1771 goto err; 1772 } 1773 1774 rate->index = rate_idx; 1775 } 1776 1777 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1778 col_id, rate->index); 1779 1780 return 0; 1781 1782 err: 1783 rate->type = LQ_NONE; 1784 return -1; 1785 } 1786 1787 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1788 struct iwl_scale_tbl_info *tbl, 1789 s32 sr, int low, int high, 1790 int current_tpt, 1791 int low_tpt, int high_tpt) 1792 { 1793 enum rs_action action = RS_ACTION_STAY; 1794 1795 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1796 (current_tpt == 0)) { 1797 IWL_DEBUG_RATE(mvm, 1798 "Decrease rate because of low SR\n"); 1799 return RS_ACTION_DOWNSCALE; 1800 } 1801 1802 if ((low_tpt == IWL_INVALID_VALUE) && 1803 (high_tpt == IWL_INVALID_VALUE) && 1804 (high != IWL_RATE_INVALID)) { 1805 IWL_DEBUG_RATE(mvm, 1806 "No data about high/low rates. Increase rate\n"); 1807 return RS_ACTION_UPSCALE; 1808 } 1809 1810 if ((high_tpt == IWL_INVALID_VALUE) && 1811 (high != IWL_RATE_INVALID) && 1812 (low_tpt != IWL_INVALID_VALUE) && 1813 (low_tpt < current_tpt)) { 1814 IWL_DEBUG_RATE(mvm, 1815 "No data about high rate and low rate is worse. Increase rate\n"); 1816 return RS_ACTION_UPSCALE; 1817 } 1818 1819 if ((high_tpt != IWL_INVALID_VALUE) && 1820 (high_tpt > current_tpt)) { 1821 IWL_DEBUG_RATE(mvm, 1822 "Higher rate is better. Increate rate\n"); 1823 return RS_ACTION_UPSCALE; 1824 } 1825 1826 if ((low_tpt != IWL_INVALID_VALUE) && 1827 (high_tpt != IWL_INVALID_VALUE) && 1828 (low_tpt < current_tpt) && 1829 (high_tpt < current_tpt)) { 1830 IWL_DEBUG_RATE(mvm, 1831 "Both high and low are worse. Maintain rate\n"); 1832 return RS_ACTION_STAY; 1833 } 1834 1835 if ((low_tpt != IWL_INVALID_VALUE) && 1836 (low_tpt > current_tpt)) { 1837 IWL_DEBUG_RATE(mvm, 1838 "Lower rate is better\n"); 1839 action = RS_ACTION_DOWNSCALE; 1840 goto out; 1841 } 1842 1843 if ((low_tpt == IWL_INVALID_VALUE) && 1844 (low != IWL_RATE_INVALID)) { 1845 IWL_DEBUG_RATE(mvm, 1846 "No data about lower rate\n"); 1847 action = RS_ACTION_DOWNSCALE; 1848 goto out; 1849 } 1850 1851 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1852 1853 out: 1854 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1855 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1856 IWL_DEBUG_RATE(mvm, 1857 "SR is above NO DECREASE. Avoid downscale\n"); 1858 action = RS_ACTION_STAY; 1859 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1860 IWL_DEBUG_RATE(mvm, 1861 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1862 action = RS_ACTION_STAY; 1863 } else { 1864 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1865 } 1866 } 1867 1868 return action; 1869 } 1870 1871 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1872 struct iwl_lq_sta *lq_sta) 1873 { 1874 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1875 * supports STBC of at least 1*SS 1876 */ 1877 if (!lq_sta->stbc_capable) 1878 return false; 1879 1880 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1881 return false; 1882 1883 return true; 1884 } 1885 1886 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1887 int *weaker, int *stronger) 1888 { 1889 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1890 if (*weaker > TPC_MAX_REDUCTION) 1891 *weaker = TPC_INVALID; 1892 1893 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1894 if (*stronger < 0) 1895 *stronger = TPC_INVALID; 1896 } 1897 1898 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1899 struct rs_rate *rate, enum nl80211_band band) 1900 { 1901 int index = rate->index; 1902 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1903 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1904 !vif->bss_conf.ps); 1905 1906 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1907 cam, sta_ps_disabled); 1908 /* 1909 * allow tpc only if power management is enabled, or bt coex 1910 * activity grade allows it and we are on 2.4Ghz. 1911 */ 1912 if ((cam || sta_ps_disabled) && 1913 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1914 return false; 1915 1916 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1917 if (is_legacy(rate)) 1918 return index == IWL_RATE_54M_INDEX; 1919 if (is_ht(rate)) 1920 return index == IWL_RATE_MCS_7_INDEX; 1921 if (is_vht(rate)) 1922 return index == IWL_RATE_MCS_7_INDEX || 1923 index == IWL_RATE_MCS_8_INDEX || 1924 index == IWL_RATE_MCS_9_INDEX; 1925 1926 WARN_ON_ONCE(1); 1927 return false; 1928 } 1929 1930 enum tpc_action { 1931 TPC_ACTION_STAY, 1932 TPC_ACTION_DECREASE, 1933 TPC_ACTION_INCREASE, 1934 TPC_ACTION_NO_RESTIRCTION, 1935 }; 1936 1937 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1938 s32 sr, int weak, int strong, 1939 int current_tpt, 1940 int weak_tpt, int strong_tpt) 1941 { 1942 /* stay until we have valid tpt */ 1943 if (current_tpt == IWL_INVALID_VALUE) { 1944 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1945 return TPC_ACTION_STAY; 1946 } 1947 1948 /* Too many failures, increase txp */ 1949 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1950 current_tpt == 0) { 1951 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1952 return TPC_ACTION_NO_RESTIRCTION; 1953 } 1954 1955 /* try decreasing first if applicable */ 1956 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1957 weak != TPC_INVALID) { 1958 if (weak_tpt == IWL_INVALID_VALUE && 1959 (strong_tpt == IWL_INVALID_VALUE || 1960 current_tpt >= strong_tpt)) { 1961 IWL_DEBUG_RATE(mvm, 1962 "no weak txp measurement. decrease txp\n"); 1963 return TPC_ACTION_DECREASE; 1964 } 1965 1966 if (weak_tpt > current_tpt) { 1967 IWL_DEBUG_RATE(mvm, 1968 "lower txp has better tpt. decrease txp\n"); 1969 return TPC_ACTION_DECREASE; 1970 } 1971 } 1972 1973 /* next, increase if needed */ 1974 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1975 strong != TPC_INVALID) { 1976 if (weak_tpt == IWL_INVALID_VALUE && 1977 strong_tpt != IWL_INVALID_VALUE && 1978 current_tpt < strong_tpt) { 1979 IWL_DEBUG_RATE(mvm, 1980 "higher txp has better tpt. increase txp\n"); 1981 return TPC_ACTION_INCREASE; 1982 } 1983 1984 if (weak_tpt < current_tpt && 1985 (strong_tpt == IWL_INVALID_VALUE || 1986 strong_tpt > current_tpt)) { 1987 IWL_DEBUG_RATE(mvm, 1988 "lower txp has worse tpt. increase txp\n"); 1989 return TPC_ACTION_INCREASE; 1990 } 1991 } 1992 1993 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 1994 return TPC_ACTION_STAY; 1995 } 1996 1997 static bool rs_tpc_perform(struct iwl_mvm *mvm, 1998 struct ieee80211_sta *sta, 1999 struct iwl_lq_sta *lq_sta, 2000 struct iwl_scale_tbl_info *tbl) 2001 { 2002 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2003 struct ieee80211_vif *vif = mvm_sta->vif; 2004 struct ieee80211_chanctx_conf *chanctx_conf; 2005 enum nl80211_band band; 2006 struct iwl_rate_scale_data *window; 2007 struct rs_rate *rate = &tbl->rate; 2008 enum tpc_action action; 2009 s32 sr; 2010 u8 cur = lq_sta->lq.reduced_tpc; 2011 int current_tpt; 2012 int weak, strong; 2013 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2014 2015 #ifdef CONFIG_MAC80211_DEBUGFS 2016 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2017 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2018 lq_sta->pers.dbg_fixed_txp_reduction); 2019 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2020 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2021 } 2022 #endif 2023 2024 rcu_read_lock(); 2025 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2026 if (WARN_ON(!chanctx_conf)) 2027 band = NUM_NL80211_BANDS; 2028 else 2029 band = chanctx_conf->def.chan->band; 2030 rcu_read_unlock(); 2031 2032 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2033 IWL_DEBUG_RATE(mvm, 2034 "tpc is not allowed. remove txp restrictions\n"); 2035 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2036 return cur != TPC_NO_REDUCTION; 2037 } 2038 2039 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2040 2041 /* Collect measured throughputs for current and adjacent rates */ 2042 window = tbl->tpc_win; 2043 sr = window[cur].success_ratio; 2044 current_tpt = window[cur].average_tpt; 2045 if (weak != TPC_INVALID) 2046 weak_tpt = window[weak].average_tpt; 2047 if (strong != TPC_INVALID) 2048 strong_tpt = window[strong].average_tpt; 2049 2050 IWL_DEBUG_RATE(mvm, 2051 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2052 cur, current_tpt, sr, weak, strong, 2053 weak_tpt, strong_tpt); 2054 2055 action = rs_get_tpc_action(mvm, sr, weak, strong, 2056 current_tpt, weak_tpt, strong_tpt); 2057 2058 /* override actions if we are on the edge */ 2059 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2060 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2061 action = TPC_ACTION_STAY; 2062 } else if (strong == TPC_INVALID && 2063 (action == TPC_ACTION_INCREASE || 2064 action == TPC_ACTION_NO_RESTIRCTION)) { 2065 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2066 action = TPC_ACTION_STAY; 2067 } 2068 2069 switch (action) { 2070 case TPC_ACTION_DECREASE: 2071 lq_sta->lq.reduced_tpc = weak; 2072 return true; 2073 case TPC_ACTION_INCREASE: 2074 lq_sta->lq.reduced_tpc = strong; 2075 return true; 2076 case TPC_ACTION_NO_RESTIRCTION: 2077 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2078 return true; 2079 case TPC_ACTION_STAY: 2080 /* do nothing */ 2081 break; 2082 } 2083 return false; 2084 } 2085 2086 /* 2087 * Do rate scaling and search for new modulation mode. 2088 */ 2089 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2090 struct ieee80211_sta *sta, 2091 struct iwl_lq_sta *lq_sta, 2092 int tid, bool ndp) 2093 { 2094 int low = IWL_RATE_INVALID; 2095 int high = IWL_RATE_INVALID; 2096 int index; 2097 struct iwl_rate_scale_data *window = NULL; 2098 int current_tpt = IWL_INVALID_VALUE; 2099 int low_tpt = IWL_INVALID_VALUE; 2100 int high_tpt = IWL_INVALID_VALUE; 2101 u32 fail_count; 2102 enum rs_action scale_action = RS_ACTION_STAY; 2103 u16 rate_mask; 2104 u8 update_lq = 0; 2105 struct iwl_scale_tbl_info *tbl, *tbl1; 2106 u8 active_tbl = 0; 2107 u8 done_search = 0; 2108 u16 high_low; 2109 s32 sr; 2110 u8 prev_agg = lq_sta->is_agg; 2111 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2112 struct rs_rate *rate; 2113 2114 lq_sta->is_agg = !!mvmsta->agg_tids; 2115 2116 /* 2117 * Select rate-scale / modulation-mode table to work with in 2118 * the rest of this function: "search" if searching for better 2119 * modulation mode, or "active" if doing rate scaling within a mode. 2120 */ 2121 if (!lq_sta->search_better_tbl) 2122 active_tbl = lq_sta->active_tbl; 2123 else 2124 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2125 2126 tbl = &(lq_sta->lq_info[active_tbl]); 2127 rate = &tbl->rate; 2128 2129 if (prev_agg != lq_sta->is_agg) { 2130 IWL_DEBUG_RATE(mvm, 2131 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2132 prev_agg, lq_sta->is_agg); 2133 rs_set_expected_tpt_table(lq_sta, tbl); 2134 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2135 } 2136 2137 /* current tx rate */ 2138 index = rate->index; 2139 2140 /* rates available for this association, and for modulation mode */ 2141 rate_mask = rs_get_supported_rates(lq_sta, rate); 2142 2143 if (!(BIT(index) & rate_mask)) { 2144 IWL_ERR(mvm, "Current Rate is not valid\n"); 2145 if (lq_sta->search_better_tbl) { 2146 /* revert to active table if search table is not valid*/ 2147 rate->type = LQ_NONE; 2148 lq_sta->search_better_tbl = 0; 2149 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2150 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2151 } 2152 return; 2153 } 2154 2155 /* Get expected throughput table and history window for current rate */ 2156 if (!tbl->expected_tpt) { 2157 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2158 return; 2159 } 2160 2161 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2162 window = &(tbl->win[index]); 2163 2164 /* 2165 * If there is not enough history to calculate actual average 2166 * throughput, keep analyzing results of more tx frames, without 2167 * changing rate or mode (bypass most of the rest of this function). 2168 * Set up new rate table in uCode only if old rate is not supported 2169 * in current association (use new rate found above). 2170 */ 2171 fail_count = window->counter - window->success_counter; 2172 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2173 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2174 IWL_DEBUG_RATE(mvm, 2175 "%s: Test Window: succ %d total %d\n", 2176 rs_pretty_rate(rate), 2177 window->success_counter, window->counter); 2178 2179 /* Can't calculate this yet; not enough history */ 2180 window->average_tpt = IWL_INVALID_VALUE; 2181 2182 /* Should we stay with this modulation mode, 2183 * or search for a new one? */ 2184 rs_stay_in_table(lq_sta, false); 2185 2186 return; 2187 } 2188 2189 /* If we are searching for better modulation mode, check success. */ 2190 if (lq_sta->search_better_tbl) { 2191 /* If good success, continue using the "search" mode; 2192 * no need to send new link quality command, since we're 2193 * continuing to use the setup that we've been trying. */ 2194 if (window->average_tpt > lq_sta->last_tpt) { 2195 IWL_DEBUG_RATE(mvm, 2196 "SWITCHING TO NEW TABLE SR: %d " 2197 "cur-tpt %d old-tpt %d\n", 2198 window->success_ratio, 2199 window->average_tpt, 2200 lq_sta->last_tpt); 2201 2202 /* Swap tables; "search" becomes "active" */ 2203 lq_sta->active_tbl = active_tbl; 2204 current_tpt = window->average_tpt; 2205 /* Else poor success; go back to mode in "active" table */ 2206 } else { 2207 IWL_DEBUG_RATE(mvm, 2208 "GOING BACK TO THE OLD TABLE: SR %d " 2209 "cur-tpt %d old-tpt %d\n", 2210 window->success_ratio, 2211 window->average_tpt, 2212 lq_sta->last_tpt); 2213 2214 /* Nullify "search" table */ 2215 rate->type = LQ_NONE; 2216 2217 /* Revert to "active" table */ 2218 active_tbl = lq_sta->active_tbl; 2219 tbl = &(lq_sta->lq_info[active_tbl]); 2220 2221 /* Revert to "active" rate and throughput info */ 2222 index = tbl->rate.index; 2223 current_tpt = lq_sta->last_tpt; 2224 2225 /* Need to set up a new rate table in uCode */ 2226 update_lq = 1; 2227 } 2228 2229 /* Either way, we've made a decision; modulation mode 2230 * search is done, allow rate adjustment next time. */ 2231 lq_sta->search_better_tbl = 0; 2232 done_search = 1; /* Don't switch modes below! */ 2233 goto lq_update; 2234 } 2235 2236 /* (Else) not in search of better modulation mode, try for better 2237 * starting rate, while staying in this mode. */ 2238 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2239 low = high_low & 0xff; 2240 high = (high_low >> 8) & 0xff; 2241 2242 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2243 2244 sr = window->success_ratio; 2245 2246 /* Collect measured throughputs for current and adjacent rates */ 2247 current_tpt = window->average_tpt; 2248 if (low != IWL_RATE_INVALID) 2249 low_tpt = tbl->win[low].average_tpt; 2250 if (high != IWL_RATE_INVALID) 2251 high_tpt = tbl->win[high].average_tpt; 2252 2253 IWL_DEBUG_RATE(mvm, 2254 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2255 rs_pretty_rate(rate), current_tpt, sr, 2256 low, high, low_tpt, high_tpt); 2257 2258 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2259 current_tpt, low_tpt, high_tpt); 2260 2261 /* Force a search in case BT doesn't like us being in MIMO */ 2262 if (is_mimo(rate) && 2263 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2264 IWL_DEBUG_RATE(mvm, 2265 "BT Coex forbids MIMO. Search for new config\n"); 2266 rs_stay_in_table(lq_sta, true); 2267 goto lq_update; 2268 } 2269 2270 switch (scale_action) { 2271 case RS_ACTION_DOWNSCALE: 2272 /* Decrease starting rate, update uCode's rate table */ 2273 if (low != IWL_RATE_INVALID) { 2274 update_lq = 1; 2275 index = low; 2276 } else { 2277 IWL_DEBUG_RATE(mvm, 2278 "At the bottom rate. Can't decrease\n"); 2279 } 2280 2281 break; 2282 case RS_ACTION_UPSCALE: 2283 /* Increase starting rate, update uCode's rate table */ 2284 if (high != IWL_RATE_INVALID) { 2285 update_lq = 1; 2286 index = high; 2287 } else { 2288 IWL_DEBUG_RATE(mvm, 2289 "At the top rate. Can't increase\n"); 2290 } 2291 2292 break; 2293 case RS_ACTION_STAY: 2294 /* No change */ 2295 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2296 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2297 break; 2298 default: 2299 break; 2300 } 2301 2302 lq_update: 2303 /* Replace uCode's rate table for the destination station. */ 2304 if (update_lq) { 2305 tbl->rate.index = index; 2306 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2307 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2308 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2309 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2310 } 2311 2312 rs_stay_in_table(lq_sta, false); 2313 2314 /* 2315 * Search for new modulation mode if we're: 2316 * 1) Not changing rates right now 2317 * 2) Not just finishing up a search 2318 * 3) Allowing a new search 2319 */ 2320 if (!update_lq && !done_search && 2321 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2322 && window->counter) { 2323 enum rs_column next_column; 2324 2325 /* Save current throughput to compare with "search" throughput*/ 2326 lq_sta->last_tpt = current_tpt; 2327 2328 IWL_DEBUG_RATE(mvm, 2329 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2330 update_lq, done_search, lq_sta->rs_state, 2331 window->counter); 2332 2333 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2334 if (next_column != RS_COLUMN_INVALID) { 2335 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2336 next_column); 2337 if (!ret) 2338 lq_sta->search_better_tbl = 1; 2339 } else { 2340 IWL_DEBUG_RATE(mvm, 2341 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2342 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2343 } 2344 2345 /* If new "search" mode was selected, set up in uCode table */ 2346 if (lq_sta->search_better_tbl) { 2347 /* Access the "search" table, clear its history. */ 2348 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 2349 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2350 2351 /* Use new "search" start rate */ 2352 index = tbl->rate.index; 2353 2354 rs_dump_rate(mvm, &tbl->rate, 2355 "Switch to SEARCH TABLE:"); 2356 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2357 } else { 2358 done_search = 1; 2359 } 2360 } 2361 2362 if (!ndp) 2363 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2364 2365 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2366 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2367 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2368 } 2369 } 2370 2371 struct rs_init_rate_info { 2372 s8 rssi; 2373 u8 rate_idx; 2374 }; 2375 2376 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2377 { -60, IWL_RATE_54M_INDEX }, 2378 { -64, IWL_RATE_48M_INDEX }, 2379 { -68, IWL_RATE_36M_INDEX }, 2380 { -80, IWL_RATE_24M_INDEX }, 2381 { -84, IWL_RATE_18M_INDEX }, 2382 { -85, IWL_RATE_12M_INDEX }, 2383 { -86, IWL_RATE_11M_INDEX }, 2384 { -88, IWL_RATE_5M_INDEX }, 2385 { -90, IWL_RATE_2M_INDEX }, 2386 { S8_MIN, IWL_RATE_1M_INDEX }, 2387 }; 2388 2389 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2390 { -60, IWL_RATE_54M_INDEX }, 2391 { -64, IWL_RATE_48M_INDEX }, 2392 { -72, IWL_RATE_36M_INDEX }, 2393 { -80, IWL_RATE_24M_INDEX }, 2394 { -84, IWL_RATE_18M_INDEX }, 2395 { -85, IWL_RATE_12M_INDEX }, 2396 { -87, IWL_RATE_9M_INDEX }, 2397 { S8_MIN, IWL_RATE_6M_INDEX }, 2398 }; 2399 2400 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2401 { -60, IWL_RATE_MCS_7_INDEX }, 2402 { -64, IWL_RATE_MCS_6_INDEX }, 2403 { -68, IWL_RATE_MCS_5_INDEX }, 2404 { -72, IWL_RATE_MCS_4_INDEX }, 2405 { -80, IWL_RATE_MCS_3_INDEX }, 2406 { -84, IWL_RATE_MCS_2_INDEX }, 2407 { -85, IWL_RATE_MCS_1_INDEX }, 2408 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2409 }; 2410 2411 /* MCS index 9 is not valid for 20MHz VHT channel width, 2412 * but is ok for 40, 80 and 160MHz channels. 2413 */ 2414 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2415 { -60, IWL_RATE_MCS_8_INDEX }, 2416 { -64, IWL_RATE_MCS_7_INDEX }, 2417 { -68, IWL_RATE_MCS_6_INDEX }, 2418 { -72, IWL_RATE_MCS_5_INDEX }, 2419 { -80, IWL_RATE_MCS_4_INDEX }, 2420 { -84, IWL_RATE_MCS_3_INDEX }, 2421 { -85, IWL_RATE_MCS_2_INDEX }, 2422 { -87, IWL_RATE_MCS_1_INDEX }, 2423 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2424 }; 2425 2426 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2427 { -60, IWL_RATE_MCS_9_INDEX }, 2428 { -64, IWL_RATE_MCS_8_INDEX }, 2429 { -68, IWL_RATE_MCS_7_INDEX }, 2430 { -72, IWL_RATE_MCS_6_INDEX }, 2431 { -80, IWL_RATE_MCS_5_INDEX }, 2432 { -84, IWL_RATE_MCS_4_INDEX }, 2433 { -85, IWL_RATE_MCS_3_INDEX }, 2434 { -87, IWL_RATE_MCS_2_INDEX }, 2435 { -88, IWL_RATE_MCS_1_INDEX }, 2436 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2437 }; 2438 2439 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2440 2441 /* Init the optimal rate based on STA caps 2442 * This combined with rssi is used to report the last tx rate 2443 * to userspace when we haven't transmitted enough frames. 2444 */ 2445 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2446 struct ieee80211_sta *sta, 2447 struct iwl_lq_sta *lq_sta) 2448 { 2449 struct rs_rate *rate = &lq_sta->optimal_rate; 2450 2451 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2452 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2453 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2454 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2455 else if (lq_sta->band == NL80211_BAND_5GHZ) 2456 rate->type = LQ_LEGACY_A; 2457 else 2458 rate->type = LQ_LEGACY_G; 2459 2460 rate->bw = rs_bw_from_sta_bw(sta); 2461 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2462 2463 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2464 2465 if (is_mimo(rate)) { 2466 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2467 } else if (is_siso(rate)) { 2468 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2469 } else { 2470 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2471 2472 if (lq_sta->band == NL80211_BAND_5GHZ) { 2473 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2474 lq_sta->optimal_nentries = 2475 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2476 } else { 2477 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2478 lq_sta->optimal_nentries = 2479 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2480 } 2481 } 2482 2483 if (is_vht(rate)) { 2484 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2485 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2486 lq_sta->optimal_nentries = 2487 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2488 } else { 2489 lq_sta->optimal_rates = rs_optimal_rates_vht; 2490 lq_sta->optimal_nentries = 2491 ARRAY_SIZE(rs_optimal_rates_vht); 2492 } 2493 } else if (is_ht(rate)) { 2494 lq_sta->optimal_rates = rs_optimal_rates_ht; 2495 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2496 } 2497 } 2498 2499 /* Compute the optimal rate index based on RSSI */ 2500 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2501 struct iwl_lq_sta *lq_sta) 2502 { 2503 struct rs_rate *rate = &lq_sta->optimal_rate; 2504 int i; 2505 2506 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2507 BITS_PER_LONG); 2508 2509 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2510 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2511 2512 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2513 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2514 rate->index = rate_idx; 2515 break; 2516 } 2517 } 2518 2519 return rate; 2520 } 2521 2522 /* Choose an initial legacy rate and antenna to use based on the RSSI 2523 * of last Rx 2524 */ 2525 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2526 struct ieee80211_sta *sta, 2527 struct iwl_lq_sta *lq_sta, 2528 enum nl80211_band band, 2529 struct rs_rate *rate) 2530 { 2531 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2532 int i, nentries; 2533 unsigned long active_rate; 2534 s8 best_rssi = S8_MIN; 2535 u8 best_ant = ANT_NONE; 2536 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2537 const struct rs_init_rate_info *initial_rates; 2538 2539 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2540 if (!(lq_sta->pers.chains & BIT(i))) 2541 continue; 2542 2543 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2544 best_rssi = lq_sta->pers.chain_signal[i]; 2545 best_ant = BIT(i); 2546 } 2547 } 2548 2549 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2550 rs_pretty_ant(best_ant), best_rssi); 2551 2552 if (best_ant != ANT_A && best_ant != ANT_B) 2553 rate->ant = first_antenna(valid_tx_ant); 2554 else 2555 rate->ant = best_ant; 2556 2557 rate->sgi = false; 2558 rate->ldpc = false; 2559 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2560 2561 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2562 BITS_PER_LONG); 2563 2564 if (band == NL80211_BAND_5GHZ) { 2565 rate->type = LQ_LEGACY_A; 2566 initial_rates = rs_optimal_rates_5ghz_legacy; 2567 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2568 } else { 2569 rate->type = LQ_LEGACY_G; 2570 initial_rates = rs_optimal_rates_24ghz_legacy; 2571 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2572 } 2573 2574 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2575 goto out; 2576 2577 /* Start from a higher rate if the corresponding debug capability 2578 * is enabled. The rate is chosen according to AP capabilities. 2579 * In case of VHT/HT when the rssi is low fallback to the case of 2580 * legacy rates. 2581 */ 2582 if (sta->vht_cap.vht_supported && 2583 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2584 /* 2585 * In AP mode, when a new station associates, rs is initialized 2586 * immediately upon association completion, before the phy 2587 * context is updated with the association parameters, so the 2588 * sta bandwidth might be wider than the phy context allows. 2589 * To avoid this issue, always initialize rs with 20mhz 2590 * bandwidth rate, and after authorization, when the phy context 2591 * is already up-to-date, re-init rs with the correct bw. 2592 */ 2593 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2594 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2595 2596 switch (bw) { 2597 case RATE_MCS_CHAN_WIDTH_40: 2598 case RATE_MCS_CHAN_WIDTH_80: 2599 case RATE_MCS_CHAN_WIDTH_160: 2600 initial_rates = rs_optimal_rates_vht; 2601 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2602 break; 2603 case RATE_MCS_CHAN_WIDTH_20: 2604 initial_rates = rs_optimal_rates_vht_20mhz; 2605 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2606 break; 2607 default: 2608 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2609 goto out; 2610 } 2611 2612 active_rate = lq_sta->active_siso_rate; 2613 rate->type = LQ_VHT_SISO; 2614 rate->bw = bw; 2615 } else if (sta->ht_cap.ht_supported && 2616 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2617 initial_rates = rs_optimal_rates_ht; 2618 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2619 active_rate = lq_sta->active_siso_rate; 2620 rate->type = LQ_HT_SISO; 2621 } else { 2622 active_rate = lq_sta->active_legacy_rate; 2623 } 2624 2625 for (i = 0; i < nentries; i++) { 2626 int rate_idx = initial_rates[i].rate_idx; 2627 2628 if ((best_rssi >= initial_rates[i].rssi) && 2629 (BIT(rate_idx) & active_rate)) { 2630 rate->index = rate_idx; 2631 break; 2632 } 2633 } 2634 2635 out: 2636 rs_dump_rate(mvm, rate, "INITIAL"); 2637 } 2638 2639 /* Save info about RSSI of last Rx */ 2640 void rs_update_last_rssi(struct iwl_mvm *mvm, 2641 struct iwl_mvm_sta *mvmsta, 2642 struct ieee80211_rx_status *rx_status) 2643 { 2644 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2645 int i; 2646 2647 lq_sta->pers.chains = rx_status->chains; 2648 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2649 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2650 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2651 lq_sta->pers.last_rssi = S8_MIN; 2652 2653 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2654 if (!(lq_sta->pers.chains & BIT(i))) 2655 continue; 2656 2657 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2658 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2659 } 2660 } 2661 2662 /** 2663 * rs_initialize_lq - Initialize a station's hardware rate table 2664 * 2665 * The uCode's station table contains a table of fallback rates 2666 * for automatic fallback during transmission. 2667 * 2668 * NOTE: This sets up a default set of values. These will be replaced later 2669 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2670 * rc80211_simple. 2671 * 2672 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2673 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2674 * which requires station table entry to exist). 2675 */ 2676 static void rs_initialize_lq(struct iwl_mvm *mvm, 2677 struct ieee80211_sta *sta, 2678 struct iwl_lq_sta *lq_sta, 2679 enum nl80211_band band) 2680 { 2681 struct iwl_scale_tbl_info *tbl; 2682 struct rs_rate *rate; 2683 u8 active_tbl = 0; 2684 2685 if (!sta || !lq_sta) 2686 return; 2687 2688 if (!lq_sta->search_better_tbl) 2689 active_tbl = lq_sta->active_tbl; 2690 else 2691 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2692 2693 tbl = &(lq_sta->lq_info[active_tbl]); 2694 rate = &tbl->rate; 2695 2696 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2697 rs_init_optimal_rate(mvm, sta, lq_sta); 2698 2699 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2700 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2701 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2702 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2703 2704 tbl->column = rs_get_column_from_rate(rate); 2705 2706 rs_set_expected_tpt_table(lq_sta, tbl); 2707 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2708 /* TODO restore station should remember the lq cmd */ 2709 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 2710 } 2711 2712 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2713 void *mvm_sta, 2714 struct ieee80211_tx_rate_control *txrc) 2715 { 2716 struct iwl_op_mode *op_mode = mvm_r; 2717 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2718 struct sk_buff *skb = txrc->skb; 2719 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2720 struct iwl_lq_sta *lq_sta; 2721 struct rs_rate *optimal_rate; 2722 u32 last_ucode_rate; 2723 2724 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2725 /* if vif isn't initialized mvm doesn't know about 2726 * this station, so don't do anything with the it 2727 */ 2728 sta = NULL; 2729 mvm_sta = NULL; 2730 } 2731 2732 if (!mvm_sta) 2733 return; 2734 2735 lq_sta = mvm_sta; 2736 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2737 info->band, &info->control.rates[0]); 2738 info->control.rates[0].count = 1; 2739 2740 /* Report the optimal rate based on rssi and STA caps if we haven't 2741 * converged yet (too little traffic) or exploring other modulations 2742 */ 2743 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2744 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2745 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2746 optimal_rate); 2747 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2748 &txrc->reported_rate); 2749 } 2750 } 2751 2752 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2753 gfp_t gfp) 2754 { 2755 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2756 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2757 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2758 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2759 2760 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2761 2762 lq_sta->pers.drv = mvm; 2763 #ifdef CONFIG_MAC80211_DEBUGFS 2764 lq_sta->pers.dbg_fixed_rate = 0; 2765 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2766 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2767 #endif 2768 lq_sta->pers.chains = 0; 2769 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2770 lq_sta->pers.last_rssi = S8_MIN; 2771 2772 return lq_sta; 2773 } 2774 2775 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2776 int nss) 2777 { 2778 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2779 (0x3 << (2 * (nss - 1))); 2780 rx_mcs >>= (2 * (nss - 1)); 2781 2782 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2783 return IWL_RATE_MCS_7_INDEX; 2784 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2785 return IWL_RATE_MCS_8_INDEX; 2786 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2787 return IWL_RATE_MCS_9_INDEX; 2788 2789 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2790 return -1; 2791 } 2792 2793 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2794 struct ieee80211_sta_vht_cap *vht_cap, 2795 struct iwl_lq_sta *lq_sta) 2796 { 2797 int i; 2798 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2799 2800 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2801 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2802 if (i == IWL_RATE_9M_INDEX) 2803 continue; 2804 2805 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2806 if (i == IWL_RATE_MCS_9_INDEX && 2807 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2808 continue; 2809 2810 lq_sta->active_siso_rate |= BIT(i); 2811 } 2812 } 2813 2814 if (sta->rx_nss < 2) 2815 return; 2816 2817 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2818 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2819 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2820 if (i == IWL_RATE_9M_INDEX) 2821 continue; 2822 2823 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2824 if (i == IWL_RATE_MCS_9_INDEX && 2825 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2826 continue; 2827 2828 lq_sta->active_mimo2_rate |= BIT(i); 2829 } 2830 } 2831 } 2832 2833 static void rs_ht_init(struct iwl_mvm *mvm, 2834 struct ieee80211_sta *sta, 2835 struct iwl_lq_sta *lq_sta, 2836 struct ieee80211_sta_ht_cap *ht_cap) 2837 { 2838 /* active_siso_rate mask includes 9 MBits (bit 5), 2839 * and CCK (bits 0-3), supp_rates[] does not; 2840 * shift to convert format, force 9 MBits off. 2841 */ 2842 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2843 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2844 lq_sta->active_siso_rate &= ~((u16)0x2); 2845 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2846 2847 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2848 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2849 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2850 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2851 2852 if (mvm->cfg->ht_params->ldpc && 2853 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2854 lq_sta->ldpc = true; 2855 2856 if (mvm->cfg->ht_params->stbc && 2857 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2858 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2859 lq_sta->stbc_capable = true; 2860 2861 lq_sta->is_vht = false; 2862 } 2863 2864 static void rs_vht_init(struct iwl_mvm *mvm, 2865 struct ieee80211_sta *sta, 2866 struct iwl_lq_sta *lq_sta, 2867 struct ieee80211_sta_vht_cap *vht_cap) 2868 { 2869 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2870 2871 if (mvm->cfg->ht_params->ldpc && 2872 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2873 lq_sta->ldpc = true; 2874 2875 if (mvm->cfg->ht_params->stbc && 2876 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2877 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2878 lq_sta->stbc_capable = true; 2879 2880 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2881 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2882 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2883 lq_sta->bfer_capable = true; 2884 2885 lq_sta->is_vht = true; 2886 } 2887 2888 #ifdef CONFIG_IWLWIFI_DEBUGFS 2889 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2890 { 2891 spin_lock_bh(&mvm->drv_stats_lock); 2892 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2893 spin_unlock_bh(&mvm->drv_stats_lock); 2894 } 2895 2896 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2897 { 2898 u8 nss = 0; 2899 2900 spin_lock(&mvm->drv_stats_lock); 2901 2902 if (agg) 2903 mvm->drv_rx_stats.agg_frames++; 2904 2905 mvm->drv_rx_stats.success_frames++; 2906 2907 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 2908 case RATE_MCS_CHAN_WIDTH_20: 2909 mvm->drv_rx_stats.bw_20_frames++; 2910 break; 2911 case RATE_MCS_CHAN_WIDTH_40: 2912 mvm->drv_rx_stats.bw_40_frames++; 2913 break; 2914 case RATE_MCS_CHAN_WIDTH_80: 2915 mvm->drv_rx_stats.bw_80_frames++; 2916 break; 2917 case RATE_MCS_CHAN_WIDTH_160: 2918 mvm->drv_rx_stats.bw_160_frames++; 2919 break; 2920 default: 2921 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2922 } 2923 2924 if (rate & RATE_MCS_HT_MSK) { 2925 mvm->drv_rx_stats.ht_frames++; 2926 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 2927 } else if (rate & RATE_MCS_VHT_MSK) { 2928 mvm->drv_rx_stats.vht_frames++; 2929 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2930 RATE_VHT_MCS_NSS_POS) + 1; 2931 } else { 2932 mvm->drv_rx_stats.legacy_frames++; 2933 } 2934 2935 if (nss == 1) 2936 mvm->drv_rx_stats.siso_frames++; 2937 else if (nss == 2) 2938 mvm->drv_rx_stats.mimo2_frames++; 2939 2940 if (rate & RATE_MCS_SGI_MSK) 2941 mvm->drv_rx_stats.sgi_frames++; 2942 else 2943 mvm->drv_rx_stats.ngi_frames++; 2944 2945 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2946 mvm->drv_rx_stats.last_frame_idx = 2947 (mvm->drv_rx_stats.last_frame_idx + 1) % 2948 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2949 2950 spin_unlock(&mvm->drv_stats_lock); 2951 } 2952 #endif 2953 2954 /* 2955 * Called after adding a new station to initialize rate scaling 2956 */ 2957 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2958 enum nl80211_band band) 2959 { 2960 int i, j; 2961 struct ieee80211_hw *hw = mvm->hw; 2962 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2963 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2964 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2965 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2966 struct ieee80211_supported_band *sband; 2967 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2968 2969 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock); 2970 2971 /* clear all non-persistent lq data */ 2972 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2973 2974 sband = hw->wiphy->bands[band]; 2975 2976 lq_sta->lq.sta_id = mvmsta->sta_id; 2977 mvmsta->amsdu_enabled = 0; 2978 mvmsta->max_amsdu_len = sta->max_amsdu_len; 2979 2980 for (j = 0; j < LQ_SIZE; j++) 2981 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2982 2983 lq_sta->flush_timer = 0; 2984 lq_sta->last_tx = jiffies; 2985 2986 IWL_DEBUG_RATE(mvm, 2987 "LQ: *** rate scale station global init for station %d ***\n", 2988 mvmsta->sta_id); 2989 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2990 * the lowest or the highest rate.. Could consider using RSSI from 2991 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2992 * after assoc.. */ 2993 2994 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 2995 lq_sta->band = sband->band; 2996 /* 2997 * active legacy rates as per supported rates bitmap 2998 */ 2999 supp = sta->supp_rates[sband->band]; 3000 lq_sta->active_legacy_rate = 0; 3001 for_each_set_bit(i, &supp, BITS_PER_LONG) 3002 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3003 3004 /* TODO: should probably account for rx_highest for both HT/VHT */ 3005 if (!vht_cap || !vht_cap->vht_supported) 3006 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3007 else 3008 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3009 3010 lq_sta->max_legacy_rate_idx = 3011 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3012 lq_sta->max_siso_rate_idx = 3013 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3014 lq_sta->max_mimo2_rate_idx = 3015 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3016 3017 IWL_DEBUG_RATE(mvm, 3018 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3019 lq_sta->active_legacy_rate, 3020 lq_sta->active_siso_rate, 3021 lq_sta->active_mimo2_rate, 3022 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3023 lq_sta->bfer_capable); 3024 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3025 lq_sta->max_legacy_rate_idx, 3026 lq_sta->max_siso_rate_idx, 3027 lq_sta->max_mimo2_rate_idx); 3028 3029 /* These values will be overridden later */ 3030 lq_sta->lq.single_stream_ant_msk = 3031 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3032 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3033 3034 /* as default allow aggregation for all tids */ 3035 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3036 lq_sta->is_agg = 0; 3037 #ifdef CONFIG_IWLWIFI_DEBUGFS 3038 iwl_mvm_reset_frame_stats(mvm); 3039 #endif 3040 rs_initialize_lq(mvm, sta, lq_sta, band); 3041 } 3042 3043 static void rs_drv_rate_update(void *mvm_r, 3044 struct ieee80211_supported_band *sband, 3045 struct cfg80211_chan_def *chandef, 3046 struct ieee80211_sta *sta, 3047 void *priv_sta, u32 changed) 3048 { 3049 struct iwl_op_mode *op_mode = mvm_r; 3050 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3051 u8 tid; 3052 3053 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3054 return; 3055 3056 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3057 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3058 ieee80211_stop_tx_ba_session(sta, tid); 3059 3060 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3061 } 3062 3063 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, 3064 struct ieee80211_sta *sta, 3065 int tid, struct ieee80211_tx_info *info, 3066 bool ndp) 3067 { 3068 int legacy_success; 3069 int retries; 3070 int i; 3071 struct iwl_lq_cmd *table; 3072 u32 lq_hwrate; 3073 struct rs_rate lq_rate, tx_resp_rate; 3074 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 3075 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 3076 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 3077 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 3078 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 3079 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3080 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3081 3082 if (!lq_sta->pers.drv) { 3083 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 3084 return; 3085 } 3086 3087 /* This packet was aggregated but doesn't carry status info */ 3088 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 3089 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 3090 return; 3091 3092 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 3093 &tx_resp_rate)) { 3094 WARN_ON_ONCE(1); 3095 return; 3096 } 3097 3098 #ifdef CONFIG_MAC80211_DEBUGFS 3099 /* Disable last tx check if we are debugging with fixed rate but 3100 * update tx stats 3101 */ 3102 if (lq_sta->pers.dbg_fixed_rate) { 3103 int index = tx_resp_rate.index; 3104 enum rs_column column; 3105 int attempts, success; 3106 3107 column = rs_get_column_from_rate(&tx_resp_rate); 3108 if (WARN_ONCE(column == RS_COLUMN_INVALID, 3109 "Can't map rate 0x%x to column", 3110 tx_resp_hwrate)) 3111 return; 3112 3113 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3114 attempts = info->status.ampdu_len; 3115 success = info->status.ampdu_ack_len; 3116 } else { 3117 attempts = info->status.rates[0].count; 3118 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3119 } 3120 3121 lq_sta->pers.tx_stats[column][index].total += attempts; 3122 lq_sta->pers.tx_stats[column][index].success += success; 3123 3124 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 3125 tx_resp_hwrate, success, attempts); 3126 return; 3127 } 3128 #endif 3129 3130 if (time_after(jiffies, 3131 (unsigned long)(lq_sta->last_tx + 3132 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 3133 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 3134 /* reach here only in case of driver RS, call directly 3135 * the unlocked version 3136 */ 3137 rs_drv_rate_init(mvm, sta, info->band); 3138 return; 3139 } 3140 lq_sta->last_tx = jiffies; 3141 3142 /* Ignore this Tx frame response if its initial rate doesn't match 3143 * that of latest Link Quality command. There may be stragglers 3144 * from a previous Link Quality command, but we're no longer interested 3145 * in those; they're either from the "active" mode while we're trying 3146 * to check "search" mode, or a prior "search" mode after we've moved 3147 * to a new "search" mode (which might become the new "active" mode). 3148 */ 3149 table = &lq_sta->lq; 3150 lq_hwrate = le32_to_cpu(table->rs_table[0]); 3151 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 3152 WARN_ON_ONCE(1); 3153 return; 3154 } 3155 3156 /* Here we actually compare this rate to the latest LQ command */ 3157 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 3158 IWL_DEBUG_RATE(mvm, 3159 "tx resp color 0x%x does not match 0x%x\n", 3160 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 3161 3162 /* Since rates mis-match, the last LQ command may have failed. 3163 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 3164 * ... driver. 3165 */ 3166 lq_sta->missed_rate_counter++; 3167 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 3168 lq_sta->missed_rate_counter = 0; 3169 IWL_DEBUG_RATE(mvm, 3170 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 3171 lq_sta->rs_state); 3172 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 3173 } 3174 /* Regardless, ignore this status info for outdated rate */ 3175 return; 3176 } 3177 3178 /* Rate did match, so reset the missed_rate_counter */ 3179 lq_sta->missed_rate_counter = 0; 3180 3181 if (!lq_sta->search_better_tbl) { 3182 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3183 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3184 } else { 3185 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3186 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3187 } 3188 3189 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 3190 IWL_DEBUG_RATE(mvm, 3191 "Neither active nor search matches tx rate\n"); 3192 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3193 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 3194 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3195 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 3196 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 3197 3198 /* no matching table found, let's by-pass the data collection 3199 * and continue to perform rate scale to find the rate table 3200 */ 3201 rs_stay_in_table(lq_sta, true); 3202 goto done; 3203 } 3204 3205 /* Updating the frame history depends on whether packets were 3206 * aggregated. 3207 * 3208 * For aggregation, all packets were transmitted at the same rate, the 3209 * first index into rate scale table. 3210 */ 3211 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3212 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 3213 info->status.ampdu_len, 3214 info->status.ampdu_ack_len, 3215 reduced_txp); 3216 3217 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 3218 * it as a single frame loss as we don't want the success ratio 3219 * to dip too quickly because a BA wasn't received. 3220 * For TPC, there's no need for this optimisation since we want 3221 * to recover very quickly from a bad power reduction and, 3222 * therefore we'd like the success ratio to get an immediate hit 3223 * when failing to get a BA, so we'd switch back to a lower or 3224 * zero power reduction. When FW transmits agg with a rate 3225 * different from the initial rate, it will not use reduced txp 3226 * and will send BA notification twice (one empty with reduced 3227 * txp equal to the value from LQ and one with reduced txp 0). 3228 * We need to update counters for each txp level accordingly. 3229 */ 3230 if (info->status.ampdu_ack_len == 0) 3231 info->status.ampdu_len = 1; 3232 3233 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, 3234 tx_resp_rate.index, 3235 info->status.ampdu_len, 3236 info->status.ampdu_ack_len); 3237 3238 /* Update success/fail counts if not searching for new mode */ 3239 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3240 lq_sta->total_success += info->status.ampdu_ack_len; 3241 lq_sta->total_failed += (info->status.ampdu_len - 3242 info->status.ampdu_ack_len); 3243 } 3244 } else { 3245 /* For legacy, update frame history with for each Tx retry. */ 3246 retries = info->status.rates[0].count - 1; 3247 /* HW doesn't send more than 15 retries */ 3248 retries = min(retries, 15); 3249 3250 /* The last transmission may have been successful */ 3251 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3252 /* Collect data for each rate used during failed TX attempts */ 3253 for (i = 0; i <= retries; ++i) { 3254 lq_hwrate = le32_to_cpu(table->rs_table[i]); 3255 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 3256 &lq_rate)) { 3257 WARN_ON_ONCE(1); 3258 return; 3259 } 3260 3261 /* Only collect stats if retried rate is in the same RS 3262 * table as active/search. 3263 */ 3264 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 3265 tmp_tbl = curr_tbl; 3266 else if (rs_rate_column_match(&lq_rate, 3267 &other_tbl->rate)) 3268 tmp_tbl = other_tbl; 3269 else 3270 continue; 3271 3272 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 3273 tx_resp_rate.index, 1, 3274 i < retries ? 0 : legacy_success, 3275 reduced_txp); 3276 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 3277 tx_resp_rate.index, 1, 3278 i < retries ? 0 : legacy_success); 3279 } 3280 3281 /* Update success/fail counts if not searching for new mode */ 3282 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3283 lq_sta->total_success += legacy_success; 3284 lq_sta->total_failed += retries + (1 - legacy_success); 3285 } 3286 } 3287 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 3288 lq_sta->last_rate_n_flags = lq_hwrate; 3289 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 3290 done: 3291 /* See if there's a better rate or modulation mode to try. */ 3292 if (sta->supp_rates[info->band]) 3293 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 3294 } 3295 3296 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3297 int tid, struct ieee80211_tx_info *info, bool ndp) 3298 { 3299 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3300 3301 /* If it's locked we are in middle of init flow 3302 * just wait for next tx status to update the lq_sta data 3303 */ 3304 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock)) 3305 return; 3306 3307 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp); 3308 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 3309 } 3310 3311 #ifdef CONFIG_MAC80211_DEBUGFS 3312 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3313 struct iwl_lq_cmd *lq_cmd, 3314 enum nl80211_band band, 3315 u32 ucode_rate) 3316 { 3317 struct rs_rate rate; 3318 int i; 3319 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3320 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3321 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3322 3323 for (i = 0; i < num_rates; i++) 3324 lq_cmd->rs_table[i] = ucode_rate_le32; 3325 3326 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3327 WARN_ON_ONCE(1); 3328 return; 3329 } 3330 3331 if (is_mimo(&rate)) 3332 lq_cmd->mimo_delim = num_rates - 1; 3333 else 3334 lq_cmd->mimo_delim = 0; 3335 3336 lq_cmd->reduced_tpc = 0; 3337 3338 if (num_of_ant(ant) == 1) 3339 lq_cmd->single_stream_ant_msk = ant; 3340 3341 if (!mvm->trans->trans_cfg->gen2) 3342 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3343 else 3344 lq_cmd->agg_frame_cnt_limit = 3345 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3346 } 3347 #endif /* CONFIG_MAC80211_DEBUGFS */ 3348 3349 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3350 struct iwl_lq_sta *lq_sta, 3351 struct rs_rate *rate, 3352 __le32 *rs_table, int *rs_table_index, 3353 int num_rates, int num_retries, 3354 u8 valid_tx_ant, bool toggle_ant) 3355 { 3356 int i, j; 3357 __le32 ucode_rate; 3358 bool bottom_reached = false; 3359 int prev_rate_idx = rate->index; 3360 int end = LINK_QUAL_MAX_RETRY_NUM; 3361 int index = *rs_table_index; 3362 3363 for (i = 0; i < num_rates && index < end; i++) { 3364 for (j = 0; j < num_retries && index < end; j++, index++) { 3365 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3366 rate)); 3367 rs_table[index] = ucode_rate; 3368 if (toggle_ant) 3369 rs_toggle_antenna(valid_tx_ant, rate); 3370 } 3371 3372 prev_rate_idx = rate->index; 3373 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3374 if (bottom_reached && !is_legacy(rate)) 3375 break; 3376 } 3377 3378 if (!bottom_reached && !is_legacy(rate)) 3379 rate->index = prev_rate_idx; 3380 3381 *rs_table_index = index; 3382 } 3383 3384 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3385 * column the rate table should look like this: 3386 * 3387 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3388 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3389 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3390 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3391 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3392 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3393 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3394 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3395 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3396 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3397 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3398 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3399 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3400 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3401 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3402 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3403 */ 3404 static void rs_build_rates_table(struct iwl_mvm *mvm, 3405 struct ieee80211_sta *sta, 3406 struct iwl_lq_sta *lq_sta, 3407 const struct rs_rate *initial_rate) 3408 { 3409 struct rs_rate rate; 3410 int num_rates, num_retries, index = 0; 3411 u8 valid_tx_ant = 0; 3412 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3413 bool toggle_ant = false; 3414 u32 color; 3415 3416 memcpy(&rate, initial_rate, sizeof(rate)); 3417 3418 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3419 3420 /* TODO: remove old API when min FW API hits 14 */ 3421 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3422 rs_stbc_allow(mvm, sta, lq_sta)) 3423 rate.stbc = true; 3424 3425 if (is_siso(&rate)) { 3426 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3427 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3428 } else if (is_mimo(&rate)) { 3429 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3430 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3431 } else { 3432 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3433 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3434 toggle_ant = true; 3435 } 3436 3437 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3438 num_rates, num_retries, valid_tx_ant, 3439 toggle_ant); 3440 3441 rs_get_lower_rate_down_column(lq_sta, &rate); 3442 3443 if (is_siso(&rate)) { 3444 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3445 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3446 lq_cmd->mimo_delim = index; 3447 } else if (is_legacy(&rate)) { 3448 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3449 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3450 } else { 3451 WARN_ON_ONCE(1); 3452 } 3453 3454 toggle_ant = true; 3455 3456 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3457 num_rates, num_retries, valid_tx_ant, 3458 toggle_ant); 3459 3460 rs_get_lower_rate_down_column(lq_sta, &rate); 3461 3462 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3463 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3464 3465 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3466 num_rates, num_retries, valid_tx_ant, 3467 toggle_ant); 3468 3469 /* update the color of the LQ command (as a counter at bits 1-3) */ 3470 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3471 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3472 } 3473 3474 struct rs_bfer_active_iter_data { 3475 struct ieee80211_sta *exclude_sta; 3476 struct iwl_mvm_sta *bfer_mvmsta; 3477 }; 3478 3479 static void rs_bfer_active_iter(void *_data, 3480 struct ieee80211_sta *sta) 3481 { 3482 struct rs_bfer_active_iter_data *data = _data; 3483 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3484 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3485 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3486 3487 if (sta == data->exclude_sta) 3488 return; 3489 3490 /* The current sta has BFER allowed */ 3491 if (ss_params & LQ_SS_BFER_ALLOWED) { 3492 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3493 3494 data->bfer_mvmsta = mvmsta; 3495 } 3496 } 3497 3498 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3499 { 3500 int prio = -1; 3501 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3502 3503 switch (viftype) { 3504 case NL80211_IFTYPE_AP: 3505 case NL80211_IFTYPE_P2P_GO: 3506 prio = 3; 3507 break; 3508 case NL80211_IFTYPE_P2P_CLIENT: 3509 prio = 2; 3510 break; 3511 case NL80211_IFTYPE_STATION: 3512 prio = 1; 3513 break; 3514 default: 3515 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3516 prio = -1; 3517 } 3518 3519 return prio; 3520 } 3521 3522 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3523 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3524 struct iwl_mvm_sta *sta2) 3525 { 3526 int prio1 = rs_bfer_priority(sta1); 3527 int prio2 = rs_bfer_priority(sta2); 3528 3529 if (prio1 > prio2) 3530 return 1; 3531 if (prio1 < prio2) 3532 return -1; 3533 return 0; 3534 } 3535 3536 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3537 struct ieee80211_sta *sta, 3538 struct iwl_lq_sta *lq_sta, 3539 const struct rs_rate *initial_rate) 3540 { 3541 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3542 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3543 struct rs_bfer_active_iter_data data = { 3544 .exclude_sta = sta, 3545 .bfer_mvmsta = NULL, 3546 }; 3547 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3548 u32 ss_params = LQ_SS_PARAMS_VALID; 3549 3550 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3551 goto out; 3552 3553 #ifdef CONFIG_MAC80211_DEBUGFS 3554 /* Check if forcing the decision is configured. 3555 * Note that SISO is forced by not allowing STBC or BFER 3556 */ 3557 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3558 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3559 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3560 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3561 3562 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3563 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3564 lq_sta->pers.ss_force); 3565 goto out; 3566 } 3567 #endif 3568 3569 if (lq_sta->stbc_capable) 3570 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3571 3572 if (!lq_sta->bfer_capable) 3573 goto out; 3574 3575 ieee80211_iterate_stations_atomic(mvm->hw, 3576 rs_bfer_active_iter, 3577 &data); 3578 bfer_mvmsta = data.bfer_mvmsta; 3579 3580 /* This code is safe as it doesn't run concurrently for different 3581 * stations. This is guaranteed by the fact that calls to 3582 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3583 */ 3584 if (!bfer_mvmsta) { 3585 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3586 3587 ss_params |= LQ_SS_BFER_ALLOWED; 3588 goto out; 3589 } 3590 3591 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3592 bfer_mvmsta->sta_id); 3593 3594 /* Disallow BFER on another STA if active and we're a higher priority */ 3595 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3596 struct iwl_lq_cmd *bfersta_lq_cmd = 3597 &bfer_mvmsta->lq_sta.rs_drv.lq; 3598 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3599 3600 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3601 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3602 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd); 3603 3604 ss_params |= LQ_SS_BFER_ALLOWED; 3605 IWL_DEBUG_RATE(mvm, 3606 "Lower priority BFER sta found (%d). Switch BFER\n", 3607 bfer_mvmsta->sta_id); 3608 } 3609 out: 3610 lq_cmd->ss_params = cpu_to_le32(ss_params); 3611 } 3612 3613 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3614 struct ieee80211_sta *sta, 3615 struct iwl_lq_sta *lq_sta, 3616 const struct rs_rate *initial_rate) 3617 { 3618 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3619 struct iwl_mvm_sta *mvmsta; 3620 struct iwl_mvm_vif *mvmvif; 3621 3622 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3623 lq_cmd->agg_time_limit = 3624 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3625 3626 #ifdef CONFIG_MAC80211_DEBUGFS 3627 if (lq_sta->pers.dbg_fixed_rate) { 3628 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3629 lq_sta->band, 3630 lq_sta->pers.dbg_fixed_rate); 3631 return; 3632 } 3633 #endif 3634 if (WARN_ON_ONCE(!sta || !initial_rate)) 3635 return; 3636 3637 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3638 3639 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3640 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3641 3642 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3643 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3644 3645 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3646 num_of_ant(initial_rate->ant) == 1) 3647 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3648 3649 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3650 3651 /* 3652 * In case of low latency, tell the firmware to leave a frame in the 3653 * Tx Fifo so that it can start a transaction in the same TxOP. This 3654 * basically allows the firmware to send bursts. 3655 */ 3656 if (iwl_mvm_vif_low_latency(mvmvif)) 3657 lq_cmd->agg_frame_cnt_limit--; 3658 3659 if (mvmsta->vif->p2p) 3660 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3661 3662 lq_cmd->agg_time_limit = 3663 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3664 } 3665 3666 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3667 { 3668 return hw->priv; 3669 } 3670 3671 /* rate scale requires free function to be implemented */ 3672 static void rs_free(void *mvm_rate) 3673 { 3674 return; 3675 } 3676 3677 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3678 { 3679 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3680 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3681 3682 IWL_DEBUG_RATE(mvm, "enter\n"); 3683 IWL_DEBUG_RATE(mvm, "leave\n"); 3684 } 3685 3686 #ifdef CONFIG_MAC80211_DEBUGFS 3687 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3688 { 3689 3690 char *type, *bw; 3691 u8 mcs = 0, nss = 0; 3692 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3693 3694 if (!(rate & RATE_MCS_HT_MSK) && 3695 !(rate & RATE_MCS_VHT_MSK) && 3696 !(rate & RATE_MCS_HE_MSK)) { 3697 int index = iwl_hwrate_to_plcp_idx(rate); 3698 3699 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3700 rs_pretty_ant(ant), 3701 index == IWL_RATE_INVALID ? "BAD" : 3702 iwl_rate_mcs[index].mbps); 3703 } 3704 3705 if (rate & RATE_MCS_VHT_MSK) { 3706 type = "VHT"; 3707 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3708 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3709 >> RATE_VHT_MCS_NSS_POS) + 1; 3710 } else if (rate & RATE_MCS_HT_MSK) { 3711 type = "HT"; 3712 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3713 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3714 >> RATE_HT_MCS_NSS_POS) + 1; 3715 } else if (rate & RATE_MCS_HE_MSK) { 3716 type = "HE"; 3717 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3718 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3719 >> RATE_VHT_MCS_NSS_POS) + 1; 3720 } else { 3721 type = "Unknown"; /* shouldn't happen */ 3722 } 3723 3724 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3725 case RATE_MCS_CHAN_WIDTH_20: 3726 bw = "20Mhz"; 3727 break; 3728 case RATE_MCS_CHAN_WIDTH_40: 3729 bw = "40Mhz"; 3730 break; 3731 case RATE_MCS_CHAN_WIDTH_80: 3732 bw = "80Mhz"; 3733 break; 3734 case RATE_MCS_CHAN_WIDTH_160: 3735 bw = "160Mhz"; 3736 break; 3737 default: 3738 bw = "BAD BW"; 3739 } 3740 3741 return scnprintf(buf, bufsz, 3742 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3743 type, rs_pretty_ant(ant), bw, mcs, nss, 3744 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3745 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3746 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3747 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3748 } 3749 3750 /** 3751 * Program the device to use fixed rate for frame transmit 3752 * This is for debugging/testing only 3753 * once the device start use fixed rate, we need to reload the module 3754 * to being back the normal operation. 3755 */ 3756 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3757 struct iwl_lq_sta *lq_sta) 3758 { 3759 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3760 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3761 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3762 3763 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3764 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3765 3766 if (lq_sta->pers.dbg_fixed_rate) { 3767 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3768 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq); 3769 } 3770 } 3771 3772 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3773 const char __user *user_buf, size_t count, loff_t *ppos) 3774 { 3775 struct iwl_lq_sta *lq_sta = file->private_data; 3776 struct iwl_mvm *mvm; 3777 char buf[64]; 3778 size_t buf_size; 3779 u32 parsed_rate; 3780 3781 mvm = lq_sta->pers.drv; 3782 memset(buf, 0, sizeof(buf)); 3783 buf_size = min(count, sizeof(buf) - 1); 3784 if (copy_from_user(buf, user_buf, buf_size)) 3785 return -EFAULT; 3786 3787 if (sscanf(buf, "%x", &parsed_rate) == 1) 3788 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3789 else 3790 lq_sta->pers.dbg_fixed_rate = 0; 3791 3792 rs_program_fix_rate(mvm, lq_sta); 3793 3794 return count; 3795 } 3796 3797 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3798 char __user *user_buf, size_t count, loff_t *ppos) 3799 { 3800 char *buff; 3801 int desc = 0; 3802 int i = 0; 3803 ssize_t ret; 3804 static const size_t bufsz = 2048; 3805 3806 struct iwl_lq_sta *lq_sta = file->private_data; 3807 struct iwl_mvm_sta *mvmsta = 3808 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3809 struct iwl_mvm *mvm; 3810 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3811 struct rs_rate *rate = &tbl->rate; 3812 u32 ss_params; 3813 3814 mvm = lq_sta->pers.drv; 3815 buff = kmalloc(bufsz, GFP_KERNEL); 3816 if (!buff) 3817 return -ENOMEM; 3818 3819 desc += scnprintf(buff + desc, bufsz - desc, 3820 "sta_id %d\n", lq_sta->lq.sta_id); 3821 desc += scnprintf(buff + desc, bufsz - desc, 3822 "failed=%d success=%d rate=0%lX\n", 3823 lq_sta->total_failed, lq_sta->total_success, 3824 lq_sta->active_legacy_rate); 3825 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3826 lq_sta->pers.dbg_fixed_rate); 3827 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3828 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3829 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3830 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3831 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3832 (is_legacy(rate)) ? "legacy" : 3833 is_vht(rate) ? "VHT" : "HT"); 3834 if (!is_legacy(rate)) { 3835 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3836 (is_siso(rate)) ? "SISO" : "MIMO2"); 3837 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3838 (is_ht20(rate)) ? "20MHz" : 3839 (is_ht40(rate)) ? "40MHz" : 3840 (is_ht80(rate)) ? "80MHz" : 3841 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3842 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3843 (rate->sgi) ? "SGI" : "NGI", 3844 (rate->ldpc) ? "LDPC" : "BCC", 3845 (lq_sta->is_agg) ? "AGG on" : "", 3846 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3847 } 3848 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3849 lq_sta->last_rate_n_flags); 3850 desc += scnprintf(buff + desc, bufsz - desc, 3851 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3852 lq_sta->lq.flags, 3853 lq_sta->lq.mimo_delim, 3854 lq_sta->lq.single_stream_ant_msk, 3855 lq_sta->lq.dual_stream_ant_msk); 3856 3857 desc += scnprintf(buff + desc, bufsz - desc, 3858 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3859 le16_to_cpu(lq_sta->lq.agg_time_limit), 3860 lq_sta->lq.agg_disable_start_th, 3861 lq_sta->lq.agg_frame_cnt_limit); 3862 3863 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3864 lq_sta->lq.reduced_tpc); 3865 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3866 desc += scnprintf(buff + desc, bufsz - desc, 3867 "single stream params: %s%s%s%s\n", 3868 (ss_params & LQ_SS_PARAMS_VALID) ? 3869 "VALID" : "INVALID", 3870 (ss_params & LQ_SS_BFER_ALLOWED) ? 3871 ", BFER" : "", 3872 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3873 ", STBC" : "", 3874 (ss_params & LQ_SS_FORCE) ? 3875 ", FORCE" : ""); 3876 desc += scnprintf(buff + desc, bufsz - desc, 3877 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3878 lq_sta->lq.initial_rate_index[0], 3879 lq_sta->lq.initial_rate_index[1], 3880 lq_sta->lq.initial_rate_index[2], 3881 lq_sta->lq.initial_rate_index[3]); 3882 3883 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3884 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3885 3886 desc += scnprintf(buff + desc, bufsz - desc, 3887 " rate[%d] 0x%X ", i, r); 3888 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3889 } 3890 3891 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3892 kfree(buff); 3893 return ret; 3894 } 3895 3896 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3897 .write = rs_sta_dbgfs_scale_table_write, 3898 .read = rs_sta_dbgfs_scale_table_read, 3899 .open = simple_open, 3900 .llseek = default_llseek, 3901 }; 3902 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3903 char __user *user_buf, size_t count, loff_t *ppos) 3904 { 3905 char *buff; 3906 int desc = 0; 3907 int i, j; 3908 ssize_t ret; 3909 struct iwl_scale_tbl_info *tbl; 3910 struct rs_rate *rate; 3911 struct iwl_lq_sta *lq_sta = file->private_data; 3912 3913 buff = kmalloc(1024, GFP_KERNEL); 3914 if (!buff) 3915 return -ENOMEM; 3916 3917 for (i = 0; i < LQ_SIZE; i++) { 3918 tbl = &(lq_sta->lq_info[i]); 3919 rate = &tbl->rate; 3920 desc += sprintf(buff+desc, 3921 "%s type=%d SGI=%d BW=%s DUP=0\n" 3922 "index=%d\n", 3923 lq_sta->active_tbl == i ? "*" : "x", 3924 rate->type, 3925 rate->sgi, 3926 is_ht20(rate) ? "20MHz" : 3927 is_ht40(rate) ? "40MHz" : 3928 is_ht80(rate) ? "80MHz" : 3929 is_ht160(rate) ? "160MHz" : "ERR", 3930 rate->index); 3931 for (j = 0; j < IWL_RATE_COUNT; j++) { 3932 desc += sprintf(buff+desc, 3933 "counter=%d success=%d %%=%d\n", 3934 tbl->win[j].counter, 3935 tbl->win[j].success_counter, 3936 tbl->win[j].success_ratio); 3937 } 3938 } 3939 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3940 kfree(buff); 3941 return ret; 3942 } 3943 3944 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3945 .read = rs_sta_dbgfs_stats_table_read, 3946 .open = simple_open, 3947 .llseek = default_llseek, 3948 }; 3949 3950 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3951 char __user *user_buf, 3952 size_t count, loff_t *ppos) 3953 { 3954 static const char * const column_name[] = { 3955 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3956 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3957 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3958 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3959 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3960 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3961 [RS_COLUMN_MIMO2] = "MIMO2", 3962 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3963 }; 3964 3965 static const char * const rate_name[] = { 3966 [IWL_RATE_1M_INDEX] = "1M", 3967 [IWL_RATE_2M_INDEX] = "2M", 3968 [IWL_RATE_5M_INDEX] = "5.5M", 3969 [IWL_RATE_11M_INDEX] = "11M", 3970 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3971 [IWL_RATE_9M_INDEX] = "9M", 3972 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3973 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3974 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3975 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3976 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3977 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3978 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3979 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3980 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3981 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3982 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3983 }; 3984 3985 char *buff, *pos, *endpos; 3986 int col, rate; 3987 ssize_t ret; 3988 struct iwl_lq_sta *lq_sta = file->private_data; 3989 struct rs_rate_stats *stats; 3990 static const size_t bufsz = 1024; 3991 3992 buff = kmalloc(bufsz, GFP_KERNEL); 3993 if (!buff) 3994 return -ENOMEM; 3995 3996 pos = buff; 3997 endpos = pos + bufsz; 3998 3999 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 4000 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 4001 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 4002 pos += scnprintf(pos, endpos - pos, "\n"); 4003 4004 for (col = 0; col < RS_COLUMN_COUNT; col++) { 4005 pos += scnprintf(pos, endpos - pos, 4006 "%s,", column_name[col]); 4007 4008 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 4009 stats = &(lq_sta->pers.tx_stats[col][rate]); 4010 pos += scnprintf(pos, endpos - pos, 4011 "%llu/%llu,", 4012 stats->success, 4013 stats->total); 4014 } 4015 pos += scnprintf(pos, endpos - pos, "\n"); 4016 } 4017 4018 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 4019 kfree(buff); 4020 return ret; 4021 } 4022 4023 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 4024 const char __user *user_buf, 4025 size_t count, loff_t *ppos) 4026 { 4027 struct iwl_lq_sta *lq_sta = file->private_data; 4028 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 4029 4030 return count; 4031 } 4032 4033 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 4034 .read = rs_sta_dbgfs_drv_tx_stats_read, 4035 .write = rs_sta_dbgfs_drv_tx_stats_write, 4036 .open = simple_open, 4037 .llseek = default_llseek, 4038 }; 4039 4040 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 4041 char __user *user_buf, 4042 size_t count, loff_t *ppos) 4043 { 4044 struct iwl_lq_sta *lq_sta = file->private_data; 4045 char buf[12]; 4046 int bufsz = sizeof(buf); 4047 int pos = 0; 4048 static const char * const ss_force_name[] = { 4049 [RS_SS_FORCE_NONE] = "none", 4050 [RS_SS_FORCE_STBC] = "stbc", 4051 [RS_SS_FORCE_BFER] = "bfer", 4052 [RS_SS_FORCE_SISO] = "siso", 4053 }; 4054 4055 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4056 ss_force_name[lq_sta->pers.ss_force]); 4057 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4058 } 4059 4060 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4061 size_t count, loff_t *ppos) 4062 { 4063 struct iwl_mvm *mvm = lq_sta->pers.drv; 4064 int ret = 0; 4065 4066 if (!strncmp("none", buf, 4)) { 4067 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4068 } else if (!strncmp("siso", buf, 4)) { 4069 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4070 } else if (!strncmp("stbc", buf, 4)) { 4071 if (lq_sta->stbc_capable) { 4072 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4073 } else { 4074 IWL_ERR(mvm, 4075 "can't force STBC. peer doesn't support\n"); 4076 ret = -EINVAL; 4077 } 4078 } else if (!strncmp("bfer", buf, 4)) { 4079 if (lq_sta->bfer_capable) { 4080 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4081 } else { 4082 IWL_ERR(mvm, 4083 "can't force BFER. peer doesn't support\n"); 4084 ret = -EINVAL; 4085 } 4086 } else { 4087 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4088 ret = -EINVAL; 4089 } 4090 return ret ?: count; 4091 } 4092 4093 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4094 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4095 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4096 debugfs_create_file(#name, mode, parent, lq_sta, \ 4097 &iwl_dbgfs_##name##_ops); \ 4098 } while (0) 4099 4100 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4101 4102 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4103 struct dentry *dir) 4104 { 4105 struct iwl_lq_sta *lq_sta = priv_sta; 4106 struct iwl_mvm_sta *mvmsta; 4107 4108 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4109 4110 if (!mvmsta->vif) 4111 return; 4112 4113 debugfs_create_file("rate_scale_table", 0600, dir, 4114 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4115 debugfs_create_file("rate_stats_table", 0400, dir, 4116 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4117 debugfs_create_file("drv_tx_stats", 0600, dir, 4118 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4119 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4120 &lq_sta->tx_agg_tid_en); 4121 debugfs_create_u8("reduced_tpc", 0600, dir, 4122 &lq_sta->pers.dbg_fixed_txp_reduction); 4123 4124 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4125 } 4126 #endif 4127 4128 /* 4129 * Initialization of rate scaling information is done by driver after 4130 * the station is added. Since mac80211 calls this function before a 4131 * station is added we ignore it. 4132 */ 4133 static void rs_rate_init_ops(void *mvm_r, 4134 struct ieee80211_supported_band *sband, 4135 struct cfg80211_chan_def *chandef, 4136 struct ieee80211_sta *sta, void *mvm_sta) 4137 { 4138 } 4139 4140 /* ops for rate scaling implemented in the driver */ 4141 static const struct rate_control_ops rs_mvm_ops_drv = { 4142 .name = RS_NAME, 4143 .tx_status = rs_drv_mac80211_tx_status, 4144 .get_rate = rs_drv_get_rate, 4145 .rate_init = rs_rate_init_ops, 4146 .alloc = rs_alloc, 4147 .free = rs_free, 4148 .alloc_sta = rs_drv_alloc_sta, 4149 .free_sta = rs_free_sta, 4150 .rate_update = rs_drv_rate_update, 4151 #ifdef CONFIG_MAC80211_DEBUGFS 4152 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4153 #endif 4154 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4155 }; 4156 4157 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4158 enum nl80211_band band, bool update) 4159 { 4160 if (iwl_mvm_has_tlc_offload(mvm)) { 4161 rs_fw_rate_init(mvm, sta, band, update); 4162 } else { 4163 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 4164 4165 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock); 4166 rs_drv_rate_init(mvm, sta, band); 4167 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 4168 } 4169 } 4170 4171 int iwl_mvm_rate_control_register(void) 4172 { 4173 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4174 } 4175 4176 void iwl_mvm_rate_control_unregister(void) 4177 { 4178 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4179 } 4180 4181 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4182 bool enable) 4183 { 4184 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4185 4186 lockdep_assert_held(&mvm->mutex); 4187 4188 if (enable) { 4189 if (mvmsta->tx_protection == 0) 4190 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4191 mvmsta->tx_protection++; 4192 } else { 4193 mvmsta->tx_protection--; 4194 if (mvmsta->tx_protection == 0) 4195 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4196 } 4197 4198 return iwl_mvm_send_lq_cmd(mvm, lq); 4199 } 4200 4201 /** 4202 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4203 * @mvmsta: The station 4204 * @enable: Enable Tx protection? 4205 */ 4206 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4207 bool enable) 4208 { 4209 if (iwl_mvm_has_tlc_offload(mvm)) 4210 return rs_fw_tx_protection(mvm, mvmsta, enable); 4211 else 4212 return rs_drv_tx_protection(mvm, mvmsta, enable); 4213 } 4214