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 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1201 int tid, struct ieee80211_tx_info *info, bool ndp) 1202 { 1203 int legacy_success; 1204 int retries; 1205 int i; 1206 struct iwl_lq_cmd *table; 1207 u32 lq_hwrate; 1208 struct rs_rate lq_rate, tx_resp_rate; 1209 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1210 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1211 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1212 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1213 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1214 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1215 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 1216 1217 /* Treat uninitialized rate scaling data same as non-existing. */ 1218 if (!lq_sta) { 1219 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1220 return; 1221 } else if (!lq_sta->pers.drv) { 1222 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1223 return; 1224 } 1225 1226 /* This packet was aggregated but doesn't carry status info */ 1227 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1228 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1229 return; 1230 1231 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 1232 &tx_resp_rate)) { 1233 WARN_ON_ONCE(1); 1234 return; 1235 } 1236 1237 #ifdef CONFIG_MAC80211_DEBUGFS 1238 /* Disable last tx check if we are debugging with fixed rate but 1239 * update tx stats */ 1240 if (lq_sta->pers.dbg_fixed_rate) { 1241 int index = tx_resp_rate.index; 1242 enum rs_column column; 1243 int attempts, success; 1244 1245 column = rs_get_column_from_rate(&tx_resp_rate); 1246 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1247 "Can't map rate 0x%x to column", 1248 tx_resp_hwrate)) 1249 return; 1250 1251 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1252 attempts = info->status.ampdu_len; 1253 success = info->status.ampdu_ack_len; 1254 } else { 1255 attempts = info->status.rates[0].count; 1256 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1257 } 1258 1259 lq_sta->pers.tx_stats[column][index].total += attempts; 1260 lq_sta->pers.tx_stats[column][index].success += success; 1261 1262 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1263 tx_resp_hwrate, success, attempts); 1264 return; 1265 } 1266 #endif 1267 1268 if (time_after(jiffies, 1269 (unsigned long)(lq_sta->last_tx + 1270 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1271 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1272 iwl_mvm_rs_rate_init(mvm, sta, info->band, true); 1273 return; 1274 } 1275 lq_sta->last_tx = jiffies; 1276 1277 /* Ignore this Tx frame response if its initial rate doesn't match 1278 * that of latest Link Quality command. There may be stragglers 1279 * from a previous Link Quality command, but we're no longer interested 1280 * in those; they're either from the "active" mode while we're trying 1281 * to check "search" mode, or a prior "search" mode after we've moved 1282 * to a new "search" mode (which might become the new "active" mode). 1283 */ 1284 table = &lq_sta->lq; 1285 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1286 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 1287 WARN_ON_ONCE(1); 1288 return; 1289 } 1290 1291 /* Here we actually compare this rate to the latest LQ command */ 1292 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1293 IWL_DEBUG_RATE(mvm, 1294 "tx resp color 0x%x does not match 0x%x\n", 1295 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1296 1297 /* 1298 * Since rates mis-match, the last LQ command may have failed. 1299 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1300 * ... driver. 1301 */ 1302 lq_sta->missed_rate_counter++; 1303 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1304 lq_sta->missed_rate_counter = 0; 1305 IWL_DEBUG_RATE(mvm, 1306 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1307 lq_sta->rs_state); 1308 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1309 } 1310 /* Regardless, ignore this status info for outdated rate */ 1311 return; 1312 } else 1313 /* Rate did match, so reset the missed_rate_counter */ 1314 lq_sta->missed_rate_counter = 0; 1315 1316 if (!lq_sta->search_better_tbl) { 1317 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1318 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1319 } else { 1320 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1321 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1322 } 1323 1324 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1325 IWL_DEBUG_RATE(mvm, 1326 "Neither active nor search matches tx rate\n"); 1327 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1328 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1329 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1330 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1331 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1332 1333 /* 1334 * no matching table found, let's by-pass the data collection 1335 * and continue to perform rate scale to find the rate table 1336 */ 1337 rs_stay_in_table(lq_sta, true); 1338 goto done; 1339 } 1340 1341 /* 1342 * Updating the frame history depends on whether packets were 1343 * aggregated. 1344 * 1345 * For aggregation, all packets were transmitted at the same rate, the 1346 * first index into rate scale table. 1347 */ 1348 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1349 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1350 info->status.ampdu_len, 1351 info->status.ampdu_ack_len, 1352 reduced_txp); 1353 1354 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1355 * it as a single frame loss as we don't want the success ratio 1356 * to dip too quickly because a BA wasn't received. 1357 * For TPC, there's no need for this optimisation since we want 1358 * to recover very quickly from a bad power reduction and, 1359 * therefore we'd like the success ratio to get an immediate hit 1360 * when failing to get a BA, so we'd switch back to a lower or 1361 * zero power reduction. When FW transmits agg with a rate 1362 * different from the initial rate, it will not use reduced txp 1363 * and will send BA notification twice (one empty with reduced 1364 * txp equal to the value from LQ and one with reduced txp 0). 1365 * We need to update counters for each txp level accordingly. 1366 */ 1367 if (info->status.ampdu_ack_len == 0) 1368 info->status.ampdu_len = 1; 1369 1370 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1371 info->status.ampdu_len, 1372 info->status.ampdu_ack_len); 1373 1374 /* Update success/fail counts if not searching for new mode */ 1375 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1376 lq_sta->total_success += info->status.ampdu_ack_len; 1377 lq_sta->total_failed += (info->status.ampdu_len - 1378 info->status.ampdu_ack_len); 1379 } 1380 } else { 1381 /* For legacy, update frame history with for each Tx retry. */ 1382 retries = info->status.rates[0].count - 1; 1383 /* HW doesn't send more than 15 retries */ 1384 retries = min(retries, 15); 1385 1386 /* The last transmission may have been successful */ 1387 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1388 /* Collect data for each rate used during failed TX attempts */ 1389 for (i = 0; i <= retries; ++i) { 1390 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1391 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 1392 &lq_rate)) { 1393 WARN_ON_ONCE(1); 1394 return; 1395 } 1396 1397 /* 1398 * Only collect stats if retried rate is in the same RS 1399 * table as active/search. 1400 */ 1401 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1402 tmp_tbl = curr_tbl; 1403 else if (rs_rate_column_match(&lq_rate, 1404 &other_tbl->rate)) 1405 tmp_tbl = other_tbl; 1406 else 1407 continue; 1408 1409 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1410 tx_resp_rate.index, 1, 1411 i < retries ? 0 : legacy_success, 1412 reduced_txp); 1413 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1414 tx_resp_rate.index, 1, 1415 i < retries ? 0 : legacy_success); 1416 } 1417 1418 /* Update success/fail counts if not searching for new mode */ 1419 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1420 lq_sta->total_success += legacy_success; 1421 lq_sta->total_failed += retries + (1 - legacy_success); 1422 } 1423 } 1424 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1425 lq_sta->last_rate_n_flags = lq_hwrate; 1426 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1427 done: 1428 /* See if there's a better rate or modulation mode to try. */ 1429 if (sta->supp_rates[info->band]) 1430 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1431 } 1432 1433 /* 1434 * mac80211 sends us Tx status 1435 */ 1436 static void rs_drv_mac80211_tx_status(void *mvm_r, 1437 struct ieee80211_supported_band *sband, 1438 struct ieee80211_sta *sta, void *priv_sta, 1439 struct sk_buff *skb) 1440 { 1441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1442 struct iwl_op_mode *op_mode = mvm_r; 1443 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1445 1446 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1447 return; 1448 1449 if (!ieee80211_is_data(hdr->frame_control) || 1450 info->flags & IEEE80211_TX_CTL_NO_ACK) 1451 return; 1452 1453 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1454 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1455 } 1456 1457 /* 1458 * Begin a period of staying with a selected modulation mode. 1459 * Set "stay_in_tbl" flag to prevent any mode switches. 1460 * Set frame tx success limits according to legacy vs. high-throughput, 1461 * and reset overall (spanning all rates) tx success history statistics. 1462 * These control how long we stay using same modulation mode before 1463 * searching for a new mode. 1464 */ 1465 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1466 struct iwl_lq_sta *lq_sta) 1467 { 1468 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1469 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1470 if (is_legacy) { 1471 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1472 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1473 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1474 } else { 1475 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1476 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1477 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1478 } 1479 lq_sta->table_count = 0; 1480 lq_sta->total_failed = 0; 1481 lq_sta->total_success = 0; 1482 lq_sta->flush_timer = jiffies; 1483 lq_sta->visited_columns = 0; 1484 } 1485 1486 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1487 { 1488 if (rate_mask) 1489 return find_last_bit(&rate_mask, BITS_PER_LONG); 1490 return IWL_RATE_INVALID; 1491 } 1492 1493 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1494 const struct rs_tx_column *column) 1495 { 1496 switch (column->mode) { 1497 case RS_LEGACY: 1498 return lq_sta->max_legacy_rate_idx; 1499 case RS_SISO: 1500 return lq_sta->max_siso_rate_idx; 1501 case RS_MIMO2: 1502 return lq_sta->max_mimo2_rate_idx; 1503 default: 1504 WARN_ON_ONCE(1); 1505 } 1506 1507 return lq_sta->max_legacy_rate_idx; 1508 } 1509 1510 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1511 const struct rs_tx_column *column, 1512 u32 bw) 1513 { 1514 /* Used to choose among HT tables */ 1515 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1516 1517 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1518 column->mode != RS_SISO && 1519 column->mode != RS_MIMO2)) 1520 return expected_tpt_legacy; 1521 1522 /* Legacy rates have only one table */ 1523 if (column->mode == RS_LEGACY) 1524 return expected_tpt_legacy; 1525 1526 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1527 /* Choose among many HT tables depending on number of streams 1528 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1529 * status */ 1530 if (column->mode == RS_SISO) { 1531 switch (bw) { 1532 case RATE_MCS_CHAN_WIDTH_20: 1533 ht_tbl_pointer = expected_tpt_siso_20MHz; 1534 break; 1535 case RATE_MCS_CHAN_WIDTH_40: 1536 ht_tbl_pointer = expected_tpt_siso_40MHz; 1537 break; 1538 case RATE_MCS_CHAN_WIDTH_80: 1539 ht_tbl_pointer = expected_tpt_siso_80MHz; 1540 break; 1541 case RATE_MCS_CHAN_WIDTH_160: 1542 ht_tbl_pointer = expected_tpt_siso_160MHz; 1543 break; 1544 default: 1545 WARN_ON_ONCE(1); 1546 } 1547 } else if (column->mode == RS_MIMO2) { 1548 switch (bw) { 1549 case RATE_MCS_CHAN_WIDTH_20: 1550 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1551 break; 1552 case RATE_MCS_CHAN_WIDTH_40: 1553 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1554 break; 1555 case RATE_MCS_CHAN_WIDTH_80: 1556 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1557 break; 1558 case RATE_MCS_CHAN_WIDTH_160: 1559 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1560 break; 1561 default: 1562 WARN_ON_ONCE(1); 1563 } 1564 } else { 1565 WARN_ON_ONCE(1); 1566 } 1567 1568 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1569 return ht_tbl_pointer[0]; 1570 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1571 return ht_tbl_pointer[1]; 1572 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1573 return ht_tbl_pointer[2]; 1574 else /* AGG+SGI */ 1575 return ht_tbl_pointer[3]; 1576 } 1577 1578 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1579 struct iwl_scale_tbl_info *tbl) 1580 { 1581 struct rs_rate *rate = &tbl->rate; 1582 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1583 1584 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1585 } 1586 1587 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1588 struct iwl_lq_sta *lq_sta, 1589 struct iwl_scale_tbl_info *tbl, /* "search" */ 1590 unsigned long rate_mask, s8 index) 1591 { 1592 struct iwl_scale_tbl_info *active_tbl = 1593 &(lq_sta->lq_info[lq_sta->active_tbl]); 1594 s32 success_ratio = active_tbl->win[index].success_ratio; 1595 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1596 const u16 *tpt_tbl = tbl->expected_tpt; 1597 u16 high_low; 1598 u32 target_tpt; 1599 int rate_idx; 1600 1601 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1602 target_tpt = 100 * expected_current_tpt; 1603 IWL_DEBUG_RATE(mvm, 1604 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1605 success_ratio, target_tpt); 1606 } else { 1607 target_tpt = lq_sta->last_tpt; 1608 IWL_DEBUG_RATE(mvm, 1609 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1610 success_ratio, target_tpt); 1611 } 1612 1613 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1614 1615 while (rate_idx != IWL_RATE_INVALID) { 1616 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1617 break; 1618 1619 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1620 tbl->rate.type); 1621 1622 rate_idx = (high_low >> 8) & 0xff; 1623 } 1624 1625 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1626 rate_idx, target_tpt, 1627 rate_idx != IWL_RATE_INVALID ? 1628 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1629 1630 return rate_idx; 1631 } 1632 1633 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1634 { 1635 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1636 struct ieee80211_vht_cap vht_cap = { 1637 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1638 .supp_mcs = sta_vht_cap->vht_mcs, 1639 }; 1640 1641 switch (sta->bandwidth) { 1642 case IEEE80211_STA_RX_BW_160: 1643 /* 1644 * Don't use 160 MHz if VHT extended NSS support 1645 * says we cannot use 2 streams, we don't want to 1646 * deal with this. 1647 * We only check MCS 0 - they will support that if 1648 * we got here at all and we don't care which MCS, 1649 * we want to determine a more global state. 1650 */ 1651 if (ieee80211_get_vht_max_nss(&vht_cap, 1652 IEEE80211_VHT_CHANWIDTH_160MHZ, 1653 0, true) < sta->rx_nss) 1654 return RATE_MCS_CHAN_WIDTH_80; 1655 return RATE_MCS_CHAN_WIDTH_160; 1656 case IEEE80211_STA_RX_BW_80: 1657 return RATE_MCS_CHAN_WIDTH_80; 1658 case IEEE80211_STA_RX_BW_40: 1659 return RATE_MCS_CHAN_WIDTH_40; 1660 case IEEE80211_STA_RX_BW_20: 1661 default: 1662 return RATE_MCS_CHAN_WIDTH_20; 1663 } 1664 } 1665 1666 /* 1667 * Check whether we should continue using same modulation mode, or 1668 * begin search for a new mode, based on: 1669 * 1) # tx successes or failures while using this mode 1670 * 2) # times calling this function 1671 * 3) elapsed time in this mode (not used, for now) 1672 */ 1673 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1674 { 1675 struct iwl_scale_tbl_info *tbl; 1676 int active_tbl; 1677 int flush_interval_passed = 0; 1678 struct iwl_mvm *mvm; 1679 1680 mvm = lq_sta->pers.drv; 1681 active_tbl = lq_sta->active_tbl; 1682 1683 tbl = &(lq_sta->lq_info[active_tbl]); 1684 1685 /* If we've been disallowing search, see if we should now allow it */ 1686 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1687 /* Elapsed time using current modulation mode */ 1688 if (lq_sta->flush_timer) 1689 flush_interval_passed = 1690 time_after(jiffies, 1691 (unsigned long)(lq_sta->flush_timer + 1692 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1693 1694 /* 1695 * Check if we should allow search for new modulation mode. 1696 * If many frames have failed or succeeded, or we've used 1697 * this same modulation for a long time, allow search, and 1698 * reset history stats that keep track of whether we should 1699 * allow a new search. Also (below) reset all bitmaps and 1700 * stats in active history. 1701 */ 1702 if (force_search || 1703 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1704 (lq_sta->total_success > lq_sta->max_success_limit) || 1705 ((!lq_sta->search_better_tbl) && 1706 (lq_sta->flush_timer) && (flush_interval_passed))) { 1707 IWL_DEBUG_RATE(mvm, 1708 "LQ: stay is expired %d %d %d\n", 1709 lq_sta->total_failed, 1710 lq_sta->total_success, 1711 flush_interval_passed); 1712 1713 /* Allow search for new mode */ 1714 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1715 IWL_DEBUG_RATE(mvm, 1716 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1717 lq_sta->total_failed = 0; 1718 lq_sta->total_success = 0; 1719 lq_sta->flush_timer = 0; 1720 /* mark the current column as visited */ 1721 lq_sta->visited_columns = BIT(tbl->column); 1722 /* 1723 * Else if we've used this modulation mode enough repetitions 1724 * (regardless of elapsed time or success/failure), reset 1725 * history bitmaps and rate-specific stats for all rates in 1726 * active table. 1727 */ 1728 } else { 1729 lq_sta->table_count++; 1730 if (lq_sta->table_count >= 1731 lq_sta->table_count_limit) { 1732 lq_sta->table_count = 0; 1733 1734 IWL_DEBUG_RATE(mvm, 1735 "LQ: stay in table clear win\n"); 1736 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1737 } 1738 } 1739 1740 /* If transitioning to allow "search", reset all history 1741 * bitmaps and stats in active table (this will become the new 1742 * "search" table). */ 1743 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1744 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1745 } 1746 } 1747 } 1748 1749 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1750 struct iwl_scale_tbl_info *tbl, 1751 enum rs_action scale_action) 1752 { 1753 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1754 int i; 1755 1756 /* 1757 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1758 * or 0, since there is no per-TID alg. 1759 */ 1760 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1761 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1762 scale_action == RS_ACTION_DOWNSCALE) 1763 mvmsta->amsdu_enabled = 0; 1764 else 1765 mvmsta->amsdu_enabled = 0xFFFF; 1766 1767 if (mvmsta->vif->bss_conf.he_support && 1768 !iwlwifi_mod_params.disable_11ax) 1769 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1770 else 1771 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1772 1773 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1774 1775 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1776 if (mvmsta->amsdu_enabled) 1777 sta->max_tid_amsdu_len[i] = 1778 iwl_mvm_max_amsdu_size(mvm, sta, i); 1779 else 1780 /* 1781 * Not so elegant, but this will effectively 1782 * prevent AMSDU on this TID 1783 */ 1784 sta->max_tid_amsdu_len[i] = 1; 1785 } 1786 } 1787 1788 /* 1789 * setup rate table in uCode 1790 */ 1791 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1792 struct ieee80211_sta *sta, 1793 struct iwl_lq_sta *lq_sta, 1794 struct iwl_scale_tbl_info *tbl) 1795 { 1796 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1797 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1798 } 1799 1800 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1801 struct ieee80211_sta *sta, 1802 struct iwl_lq_sta *lq_sta, 1803 struct iwl_scale_tbl_info *tbl, 1804 enum rs_action scale_action) 1805 { 1806 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1807 return false; 1808 1809 if (!is_vht_siso(&tbl->rate)) 1810 return false; 1811 1812 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1813 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1814 (scale_action == RS_ACTION_DOWNSCALE)) { 1815 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1816 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1817 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1818 goto tweaked; 1819 } 1820 1821 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1822 * sustainable, i.e. we're past the test window. We can't go back 1823 * if MCS5 is just tested as this will happen always after switching 1824 * to 20Mhz MCS4 because the rate stats are cleared. 1825 */ 1826 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1827 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1828 (scale_action == RS_ACTION_STAY)) || 1829 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1830 (scale_action == RS_ACTION_UPSCALE)))) { 1831 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1832 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1833 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1834 goto tweaked; 1835 } 1836 1837 return false; 1838 1839 tweaked: 1840 rs_set_expected_tpt_table(lq_sta, tbl); 1841 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1842 return true; 1843 } 1844 1845 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1846 struct iwl_lq_sta *lq_sta, 1847 struct ieee80211_sta *sta, 1848 struct iwl_scale_tbl_info *tbl) 1849 { 1850 int i, j, max_rate; 1851 enum rs_column next_col_id; 1852 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1853 const struct rs_tx_column *next_col; 1854 allow_column_func_t allow_func; 1855 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1856 const u16 *expected_tpt_tbl; 1857 u16 tpt, max_expected_tpt; 1858 1859 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1860 next_col_id = curr_col->next_columns[i]; 1861 1862 if (next_col_id == RS_COLUMN_INVALID) 1863 continue; 1864 1865 if (lq_sta->visited_columns & BIT(next_col_id)) { 1866 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1867 next_col_id); 1868 continue; 1869 } 1870 1871 next_col = &rs_tx_columns[next_col_id]; 1872 1873 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1874 IWL_DEBUG_RATE(mvm, 1875 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1876 next_col_id, valid_ants, next_col->ant); 1877 continue; 1878 } 1879 1880 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1881 allow_func = next_col->checks[j]; 1882 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1883 next_col)) 1884 break; 1885 } 1886 1887 if (j != MAX_COLUMN_CHECKS) { 1888 IWL_DEBUG_RATE(mvm, 1889 "Skip column %d: not allowed (check %d failed)\n", 1890 next_col_id, j); 1891 1892 continue; 1893 } 1894 1895 tpt = lq_sta->last_tpt / 100; 1896 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1897 rs_bw_from_sta_bw(sta)); 1898 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1899 continue; 1900 1901 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1902 if (max_rate == IWL_RATE_INVALID) { 1903 IWL_DEBUG_RATE(mvm, 1904 "Skip column %d: no rate is allowed in this column\n", 1905 next_col_id); 1906 continue; 1907 } 1908 1909 max_expected_tpt = expected_tpt_tbl[max_rate]; 1910 if (tpt >= max_expected_tpt) { 1911 IWL_DEBUG_RATE(mvm, 1912 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1913 next_col_id, max_expected_tpt, tpt); 1914 continue; 1915 } 1916 1917 IWL_DEBUG_RATE(mvm, 1918 "Found potential column %d. Max expected %d current %d\n", 1919 next_col_id, max_expected_tpt, tpt); 1920 break; 1921 } 1922 1923 if (i == MAX_NEXT_COLUMNS) 1924 return RS_COLUMN_INVALID; 1925 1926 return next_col_id; 1927 } 1928 1929 static int rs_switch_to_column(struct iwl_mvm *mvm, 1930 struct iwl_lq_sta *lq_sta, 1931 struct ieee80211_sta *sta, 1932 enum rs_column col_id) 1933 { 1934 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1935 struct iwl_scale_tbl_info *search_tbl = 1936 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1937 struct rs_rate *rate = &search_tbl->rate; 1938 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1939 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1940 unsigned long rate_mask = 0; 1941 u32 rate_idx = 0; 1942 1943 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1944 1945 rate->sgi = column->sgi; 1946 rate->ant = column->ant; 1947 1948 if (column->mode == RS_LEGACY) { 1949 if (lq_sta->band == NL80211_BAND_5GHZ) 1950 rate->type = LQ_LEGACY_A; 1951 else 1952 rate->type = LQ_LEGACY_G; 1953 1954 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1955 rate->ldpc = false; 1956 rate_mask = lq_sta->active_legacy_rate; 1957 } else if (column->mode == RS_SISO) { 1958 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1959 rate_mask = lq_sta->active_siso_rate; 1960 } else if (column->mode == RS_MIMO2) { 1961 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1962 rate_mask = lq_sta->active_mimo2_rate; 1963 } else { 1964 WARN_ONCE(1, "Bad column mode"); 1965 } 1966 1967 if (column->mode != RS_LEGACY) { 1968 rate->bw = rs_bw_from_sta_bw(sta); 1969 rate->ldpc = lq_sta->ldpc; 1970 } 1971 1972 search_tbl->column = col_id; 1973 rs_set_expected_tpt_table(lq_sta, search_tbl); 1974 1975 lq_sta->visited_columns |= BIT(col_id); 1976 1977 /* Get the best matching rate if we're changing modes. e.g. 1978 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1979 */ 1980 if (curr_column->mode != column->mode) { 1981 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1982 rate_mask, rate->index); 1983 1984 if ((rate_idx == IWL_RATE_INVALID) || 1985 !(BIT(rate_idx) & rate_mask)) { 1986 IWL_DEBUG_RATE(mvm, 1987 "can not switch with index %d" 1988 " rate mask %lx\n", 1989 rate_idx, rate_mask); 1990 1991 goto err; 1992 } 1993 1994 rate->index = rate_idx; 1995 } 1996 1997 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1998 col_id, rate->index); 1999 2000 return 0; 2001 2002 err: 2003 rate->type = LQ_NONE; 2004 return -1; 2005 } 2006 2007 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 2008 struct iwl_scale_tbl_info *tbl, 2009 s32 sr, int low, int high, 2010 int current_tpt, 2011 int low_tpt, int high_tpt) 2012 { 2013 enum rs_action action = RS_ACTION_STAY; 2014 2015 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 2016 (current_tpt == 0)) { 2017 IWL_DEBUG_RATE(mvm, 2018 "Decrease rate because of low SR\n"); 2019 return RS_ACTION_DOWNSCALE; 2020 } 2021 2022 if ((low_tpt == IWL_INVALID_VALUE) && 2023 (high_tpt == IWL_INVALID_VALUE) && 2024 (high != IWL_RATE_INVALID)) { 2025 IWL_DEBUG_RATE(mvm, 2026 "No data about high/low rates. Increase rate\n"); 2027 return RS_ACTION_UPSCALE; 2028 } 2029 2030 if ((high_tpt == IWL_INVALID_VALUE) && 2031 (high != IWL_RATE_INVALID) && 2032 (low_tpt != IWL_INVALID_VALUE) && 2033 (low_tpt < current_tpt)) { 2034 IWL_DEBUG_RATE(mvm, 2035 "No data about high rate and low rate is worse. Increase rate\n"); 2036 return RS_ACTION_UPSCALE; 2037 } 2038 2039 if ((high_tpt != IWL_INVALID_VALUE) && 2040 (high_tpt > current_tpt)) { 2041 IWL_DEBUG_RATE(mvm, 2042 "Higher rate is better. Increate rate\n"); 2043 return RS_ACTION_UPSCALE; 2044 } 2045 2046 if ((low_tpt != IWL_INVALID_VALUE) && 2047 (high_tpt != IWL_INVALID_VALUE) && 2048 (low_tpt < current_tpt) && 2049 (high_tpt < current_tpt)) { 2050 IWL_DEBUG_RATE(mvm, 2051 "Both high and low are worse. Maintain rate\n"); 2052 return RS_ACTION_STAY; 2053 } 2054 2055 if ((low_tpt != IWL_INVALID_VALUE) && 2056 (low_tpt > current_tpt)) { 2057 IWL_DEBUG_RATE(mvm, 2058 "Lower rate is better\n"); 2059 action = RS_ACTION_DOWNSCALE; 2060 goto out; 2061 } 2062 2063 if ((low_tpt == IWL_INVALID_VALUE) && 2064 (low != IWL_RATE_INVALID)) { 2065 IWL_DEBUG_RATE(mvm, 2066 "No data about lower rate\n"); 2067 action = RS_ACTION_DOWNSCALE; 2068 goto out; 2069 } 2070 2071 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2072 2073 out: 2074 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2075 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2076 IWL_DEBUG_RATE(mvm, 2077 "SR is above NO DECREASE. Avoid downscale\n"); 2078 action = RS_ACTION_STAY; 2079 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2080 IWL_DEBUG_RATE(mvm, 2081 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2082 action = RS_ACTION_STAY; 2083 } else { 2084 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2085 } 2086 } 2087 2088 return action; 2089 } 2090 2091 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2092 struct iwl_lq_sta *lq_sta) 2093 { 2094 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2095 * supports STBC of at least 1*SS 2096 */ 2097 if (!lq_sta->stbc_capable) 2098 return false; 2099 2100 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2101 return false; 2102 2103 return true; 2104 } 2105 2106 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2107 int *weaker, int *stronger) 2108 { 2109 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2110 if (*weaker > TPC_MAX_REDUCTION) 2111 *weaker = TPC_INVALID; 2112 2113 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2114 if (*stronger < 0) 2115 *stronger = TPC_INVALID; 2116 } 2117 2118 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2119 struct rs_rate *rate, enum nl80211_band band) 2120 { 2121 int index = rate->index; 2122 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2123 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2124 !vif->bss_conf.ps); 2125 2126 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2127 cam, sta_ps_disabled); 2128 /* 2129 * allow tpc only if power management is enabled, or bt coex 2130 * activity grade allows it and we are on 2.4Ghz. 2131 */ 2132 if ((cam || sta_ps_disabled) && 2133 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2134 return false; 2135 2136 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2137 if (is_legacy(rate)) 2138 return index == IWL_RATE_54M_INDEX; 2139 if (is_ht(rate)) 2140 return index == IWL_RATE_MCS_7_INDEX; 2141 if (is_vht(rate)) 2142 return index == IWL_RATE_MCS_7_INDEX || 2143 index == IWL_RATE_MCS_8_INDEX || 2144 index == IWL_RATE_MCS_9_INDEX; 2145 2146 WARN_ON_ONCE(1); 2147 return false; 2148 } 2149 2150 enum tpc_action { 2151 TPC_ACTION_STAY, 2152 TPC_ACTION_DECREASE, 2153 TPC_ACTION_INCREASE, 2154 TPC_ACTION_NO_RESTIRCTION, 2155 }; 2156 2157 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2158 s32 sr, int weak, int strong, 2159 int current_tpt, 2160 int weak_tpt, int strong_tpt) 2161 { 2162 /* stay until we have valid tpt */ 2163 if (current_tpt == IWL_INVALID_VALUE) { 2164 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2165 return TPC_ACTION_STAY; 2166 } 2167 2168 /* Too many failures, increase txp */ 2169 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2170 current_tpt == 0) { 2171 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2172 return TPC_ACTION_NO_RESTIRCTION; 2173 } 2174 2175 /* try decreasing first if applicable */ 2176 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2177 weak != TPC_INVALID) { 2178 if (weak_tpt == IWL_INVALID_VALUE && 2179 (strong_tpt == IWL_INVALID_VALUE || 2180 current_tpt >= strong_tpt)) { 2181 IWL_DEBUG_RATE(mvm, 2182 "no weak txp measurement. decrease txp\n"); 2183 return TPC_ACTION_DECREASE; 2184 } 2185 2186 if (weak_tpt > current_tpt) { 2187 IWL_DEBUG_RATE(mvm, 2188 "lower txp has better tpt. decrease txp\n"); 2189 return TPC_ACTION_DECREASE; 2190 } 2191 } 2192 2193 /* next, increase if needed */ 2194 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2195 strong != TPC_INVALID) { 2196 if (weak_tpt == IWL_INVALID_VALUE && 2197 strong_tpt != IWL_INVALID_VALUE && 2198 current_tpt < strong_tpt) { 2199 IWL_DEBUG_RATE(mvm, 2200 "higher txp has better tpt. increase txp\n"); 2201 return TPC_ACTION_INCREASE; 2202 } 2203 2204 if (weak_tpt < current_tpt && 2205 (strong_tpt == IWL_INVALID_VALUE || 2206 strong_tpt > current_tpt)) { 2207 IWL_DEBUG_RATE(mvm, 2208 "lower txp has worse tpt. increase txp\n"); 2209 return TPC_ACTION_INCREASE; 2210 } 2211 } 2212 2213 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2214 return TPC_ACTION_STAY; 2215 } 2216 2217 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2218 struct ieee80211_sta *sta, 2219 struct iwl_lq_sta *lq_sta, 2220 struct iwl_scale_tbl_info *tbl) 2221 { 2222 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2223 struct ieee80211_vif *vif = mvm_sta->vif; 2224 struct ieee80211_chanctx_conf *chanctx_conf; 2225 enum nl80211_band band; 2226 struct iwl_rate_scale_data *window; 2227 struct rs_rate *rate = &tbl->rate; 2228 enum tpc_action action; 2229 s32 sr; 2230 u8 cur = lq_sta->lq.reduced_tpc; 2231 int current_tpt; 2232 int weak, strong; 2233 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2234 2235 #ifdef CONFIG_MAC80211_DEBUGFS 2236 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2237 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2238 lq_sta->pers.dbg_fixed_txp_reduction); 2239 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2240 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2241 } 2242 #endif 2243 2244 rcu_read_lock(); 2245 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2246 if (WARN_ON(!chanctx_conf)) 2247 band = NUM_NL80211_BANDS; 2248 else 2249 band = chanctx_conf->def.chan->band; 2250 rcu_read_unlock(); 2251 2252 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2253 IWL_DEBUG_RATE(mvm, 2254 "tpc is not allowed. remove txp restrictions\n"); 2255 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2256 return cur != TPC_NO_REDUCTION; 2257 } 2258 2259 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2260 2261 /* Collect measured throughputs for current and adjacent rates */ 2262 window = tbl->tpc_win; 2263 sr = window[cur].success_ratio; 2264 current_tpt = window[cur].average_tpt; 2265 if (weak != TPC_INVALID) 2266 weak_tpt = window[weak].average_tpt; 2267 if (strong != TPC_INVALID) 2268 strong_tpt = window[strong].average_tpt; 2269 2270 IWL_DEBUG_RATE(mvm, 2271 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2272 cur, current_tpt, sr, weak, strong, 2273 weak_tpt, strong_tpt); 2274 2275 action = rs_get_tpc_action(mvm, sr, weak, strong, 2276 current_tpt, weak_tpt, strong_tpt); 2277 2278 /* override actions if we are on the edge */ 2279 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2280 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2281 action = TPC_ACTION_STAY; 2282 } else if (strong == TPC_INVALID && 2283 (action == TPC_ACTION_INCREASE || 2284 action == TPC_ACTION_NO_RESTIRCTION)) { 2285 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2286 action = TPC_ACTION_STAY; 2287 } 2288 2289 switch (action) { 2290 case TPC_ACTION_DECREASE: 2291 lq_sta->lq.reduced_tpc = weak; 2292 return true; 2293 case TPC_ACTION_INCREASE: 2294 lq_sta->lq.reduced_tpc = strong; 2295 return true; 2296 case TPC_ACTION_NO_RESTIRCTION: 2297 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2298 return true; 2299 case TPC_ACTION_STAY: 2300 /* do nothing */ 2301 break; 2302 } 2303 return false; 2304 } 2305 2306 /* 2307 * Do rate scaling and search for new modulation mode. 2308 */ 2309 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2310 struct ieee80211_sta *sta, 2311 struct iwl_lq_sta *lq_sta, 2312 int tid, bool ndp) 2313 { 2314 int low = IWL_RATE_INVALID; 2315 int high = IWL_RATE_INVALID; 2316 int index; 2317 struct iwl_rate_scale_data *window = NULL; 2318 int current_tpt = IWL_INVALID_VALUE; 2319 int low_tpt = IWL_INVALID_VALUE; 2320 int high_tpt = IWL_INVALID_VALUE; 2321 u32 fail_count; 2322 enum rs_action scale_action = RS_ACTION_STAY; 2323 u16 rate_mask; 2324 u8 update_lq = 0; 2325 struct iwl_scale_tbl_info *tbl, *tbl1; 2326 u8 active_tbl = 0; 2327 u8 done_search = 0; 2328 u16 high_low; 2329 s32 sr; 2330 u8 prev_agg = lq_sta->is_agg; 2331 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2332 struct rs_rate *rate; 2333 2334 lq_sta->is_agg = !!mvmsta->agg_tids; 2335 2336 /* 2337 * Select rate-scale / modulation-mode table to work with in 2338 * the rest of this function: "search" if searching for better 2339 * modulation mode, or "active" if doing rate scaling within a mode. 2340 */ 2341 if (!lq_sta->search_better_tbl) 2342 active_tbl = lq_sta->active_tbl; 2343 else 2344 active_tbl = 1 - lq_sta->active_tbl; 2345 2346 tbl = &(lq_sta->lq_info[active_tbl]); 2347 rate = &tbl->rate; 2348 2349 if (prev_agg != lq_sta->is_agg) { 2350 IWL_DEBUG_RATE(mvm, 2351 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2352 prev_agg, lq_sta->is_agg); 2353 rs_set_expected_tpt_table(lq_sta, tbl); 2354 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2355 } 2356 2357 /* current tx rate */ 2358 index = rate->index; 2359 2360 /* rates available for this association, and for modulation mode */ 2361 rate_mask = rs_get_supported_rates(lq_sta, rate); 2362 2363 if (!(BIT(index) & rate_mask)) { 2364 IWL_ERR(mvm, "Current Rate is not valid\n"); 2365 if (lq_sta->search_better_tbl) { 2366 /* revert to active table if search table is not valid*/ 2367 rate->type = LQ_NONE; 2368 lq_sta->search_better_tbl = 0; 2369 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2370 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2371 } 2372 return; 2373 } 2374 2375 /* Get expected throughput table and history window for current rate */ 2376 if (!tbl->expected_tpt) { 2377 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2378 return; 2379 } 2380 2381 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2382 window = &(tbl->win[index]); 2383 2384 /* 2385 * If there is not enough history to calculate actual average 2386 * throughput, keep analyzing results of more tx frames, without 2387 * changing rate or mode (bypass most of the rest of this function). 2388 * Set up new rate table in uCode only if old rate is not supported 2389 * in current association (use new rate found above). 2390 */ 2391 fail_count = window->counter - window->success_counter; 2392 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2393 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2394 IWL_DEBUG_RATE(mvm, 2395 "%s: Test Window: succ %d total %d\n", 2396 rs_pretty_rate(rate), 2397 window->success_counter, window->counter); 2398 2399 /* Can't calculate this yet; not enough history */ 2400 window->average_tpt = IWL_INVALID_VALUE; 2401 2402 /* Should we stay with this modulation mode, 2403 * or search for a new one? */ 2404 rs_stay_in_table(lq_sta, false); 2405 2406 return; 2407 } 2408 2409 /* If we are searching for better modulation mode, check success. */ 2410 if (lq_sta->search_better_tbl) { 2411 /* If good success, continue using the "search" mode; 2412 * no need to send new link quality command, since we're 2413 * continuing to use the setup that we've been trying. */ 2414 if (window->average_tpt > lq_sta->last_tpt) { 2415 IWL_DEBUG_RATE(mvm, 2416 "SWITCHING TO NEW TABLE SR: %d " 2417 "cur-tpt %d old-tpt %d\n", 2418 window->success_ratio, 2419 window->average_tpt, 2420 lq_sta->last_tpt); 2421 2422 /* Swap tables; "search" becomes "active" */ 2423 lq_sta->active_tbl = active_tbl; 2424 current_tpt = window->average_tpt; 2425 /* Else poor success; go back to mode in "active" table */ 2426 } else { 2427 IWL_DEBUG_RATE(mvm, 2428 "GOING BACK TO THE OLD TABLE: SR %d " 2429 "cur-tpt %d old-tpt %d\n", 2430 window->success_ratio, 2431 window->average_tpt, 2432 lq_sta->last_tpt); 2433 2434 /* Nullify "search" table */ 2435 rate->type = LQ_NONE; 2436 2437 /* Revert to "active" table */ 2438 active_tbl = lq_sta->active_tbl; 2439 tbl = &(lq_sta->lq_info[active_tbl]); 2440 2441 /* Revert to "active" rate and throughput info */ 2442 index = tbl->rate.index; 2443 current_tpt = lq_sta->last_tpt; 2444 2445 /* Need to set up a new rate table in uCode */ 2446 update_lq = 1; 2447 } 2448 2449 /* Either way, we've made a decision; modulation mode 2450 * search is done, allow rate adjustment next time. */ 2451 lq_sta->search_better_tbl = 0; 2452 done_search = 1; /* Don't switch modes below! */ 2453 goto lq_update; 2454 } 2455 2456 /* (Else) not in search of better modulation mode, try for better 2457 * starting rate, while staying in this mode. */ 2458 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2459 low = high_low & 0xff; 2460 high = (high_low >> 8) & 0xff; 2461 2462 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2463 2464 sr = window->success_ratio; 2465 2466 /* Collect measured throughputs for current and adjacent rates */ 2467 current_tpt = window->average_tpt; 2468 if (low != IWL_RATE_INVALID) 2469 low_tpt = tbl->win[low].average_tpt; 2470 if (high != IWL_RATE_INVALID) 2471 high_tpt = tbl->win[high].average_tpt; 2472 2473 IWL_DEBUG_RATE(mvm, 2474 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2475 rs_pretty_rate(rate), current_tpt, sr, 2476 low, high, low_tpt, high_tpt); 2477 2478 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2479 current_tpt, low_tpt, high_tpt); 2480 2481 /* Force a search in case BT doesn't like us being in MIMO */ 2482 if (is_mimo(rate) && 2483 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2484 IWL_DEBUG_RATE(mvm, 2485 "BT Coex forbids MIMO. Search for new config\n"); 2486 rs_stay_in_table(lq_sta, true); 2487 goto lq_update; 2488 } 2489 2490 switch (scale_action) { 2491 case RS_ACTION_DOWNSCALE: 2492 /* Decrease starting rate, update uCode's rate table */ 2493 if (low != IWL_RATE_INVALID) { 2494 update_lq = 1; 2495 index = low; 2496 } else { 2497 IWL_DEBUG_RATE(mvm, 2498 "At the bottom rate. Can't decrease\n"); 2499 } 2500 2501 break; 2502 case RS_ACTION_UPSCALE: 2503 /* Increase starting rate, update uCode's rate table */ 2504 if (high != IWL_RATE_INVALID) { 2505 update_lq = 1; 2506 index = high; 2507 } else { 2508 IWL_DEBUG_RATE(mvm, 2509 "At the top rate. Can't increase\n"); 2510 } 2511 2512 break; 2513 case RS_ACTION_STAY: 2514 /* No change */ 2515 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2516 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2517 break; 2518 default: 2519 break; 2520 } 2521 2522 lq_update: 2523 /* Replace uCode's rate table for the destination station. */ 2524 if (update_lq) { 2525 tbl->rate.index = index; 2526 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2527 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2528 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2529 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2530 } 2531 2532 rs_stay_in_table(lq_sta, false); 2533 2534 /* 2535 * Search for new modulation mode if we're: 2536 * 1) Not changing rates right now 2537 * 2) Not just finishing up a search 2538 * 3) Allowing a new search 2539 */ 2540 if (!update_lq && !done_search && 2541 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2542 && window->counter) { 2543 enum rs_column next_column; 2544 2545 /* Save current throughput to compare with "search" throughput*/ 2546 lq_sta->last_tpt = current_tpt; 2547 2548 IWL_DEBUG_RATE(mvm, 2549 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2550 update_lq, done_search, lq_sta->rs_state, 2551 window->counter); 2552 2553 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2554 if (next_column != RS_COLUMN_INVALID) { 2555 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2556 next_column); 2557 if (!ret) 2558 lq_sta->search_better_tbl = 1; 2559 } else { 2560 IWL_DEBUG_RATE(mvm, 2561 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2562 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2563 } 2564 2565 /* If new "search" mode was selected, set up in uCode table */ 2566 if (lq_sta->search_better_tbl) { 2567 /* Access the "search" table, clear its history. */ 2568 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2569 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2570 2571 /* Use new "search" start rate */ 2572 index = tbl->rate.index; 2573 2574 rs_dump_rate(mvm, &tbl->rate, 2575 "Switch to SEARCH TABLE:"); 2576 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2577 } else { 2578 done_search = 1; 2579 } 2580 } 2581 2582 if (!ndp) 2583 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2584 2585 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2586 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2587 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2588 } 2589 } 2590 2591 struct rs_init_rate_info { 2592 s8 rssi; 2593 u8 rate_idx; 2594 }; 2595 2596 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2597 { -60, IWL_RATE_54M_INDEX }, 2598 { -64, IWL_RATE_48M_INDEX }, 2599 { -68, IWL_RATE_36M_INDEX }, 2600 { -80, IWL_RATE_24M_INDEX }, 2601 { -84, IWL_RATE_18M_INDEX }, 2602 { -85, IWL_RATE_12M_INDEX }, 2603 { -86, IWL_RATE_11M_INDEX }, 2604 { -88, IWL_RATE_5M_INDEX }, 2605 { -90, IWL_RATE_2M_INDEX }, 2606 { S8_MIN, IWL_RATE_1M_INDEX }, 2607 }; 2608 2609 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2610 { -60, IWL_RATE_54M_INDEX }, 2611 { -64, IWL_RATE_48M_INDEX }, 2612 { -72, IWL_RATE_36M_INDEX }, 2613 { -80, IWL_RATE_24M_INDEX }, 2614 { -84, IWL_RATE_18M_INDEX }, 2615 { -85, IWL_RATE_12M_INDEX }, 2616 { -87, IWL_RATE_9M_INDEX }, 2617 { S8_MIN, IWL_RATE_6M_INDEX }, 2618 }; 2619 2620 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2621 { -60, IWL_RATE_MCS_7_INDEX }, 2622 { -64, IWL_RATE_MCS_6_INDEX }, 2623 { -68, IWL_RATE_MCS_5_INDEX }, 2624 { -72, IWL_RATE_MCS_4_INDEX }, 2625 { -80, IWL_RATE_MCS_3_INDEX }, 2626 { -84, IWL_RATE_MCS_2_INDEX }, 2627 { -85, IWL_RATE_MCS_1_INDEX }, 2628 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2629 }; 2630 2631 /* MCS index 9 is not valid for 20MHz VHT channel width, 2632 * but is ok for 40, 80 and 160MHz channels. 2633 */ 2634 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2635 { -60, IWL_RATE_MCS_8_INDEX }, 2636 { -64, IWL_RATE_MCS_7_INDEX }, 2637 { -68, IWL_RATE_MCS_6_INDEX }, 2638 { -72, IWL_RATE_MCS_5_INDEX }, 2639 { -80, IWL_RATE_MCS_4_INDEX }, 2640 { -84, IWL_RATE_MCS_3_INDEX }, 2641 { -85, IWL_RATE_MCS_2_INDEX }, 2642 { -87, IWL_RATE_MCS_1_INDEX }, 2643 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2644 }; 2645 2646 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2647 { -60, IWL_RATE_MCS_9_INDEX }, 2648 { -64, IWL_RATE_MCS_8_INDEX }, 2649 { -68, IWL_RATE_MCS_7_INDEX }, 2650 { -72, IWL_RATE_MCS_6_INDEX }, 2651 { -80, IWL_RATE_MCS_5_INDEX }, 2652 { -84, IWL_RATE_MCS_4_INDEX }, 2653 { -85, IWL_RATE_MCS_3_INDEX }, 2654 { -87, IWL_RATE_MCS_2_INDEX }, 2655 { -88, IWL_RATE_MCS_1_INDEX }, 2656 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2657 }; 2658 2659 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2660 2661 /* Init the optimal rate based on STA caps 2662 * This combined with rssi is used to report the last tx rate 2663 * to userspace when we haven't transmitted enough frames. 2664 */ 2665 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2666 struct ieee80211_sta *sta, 2667 struct iwl_lq_sta *lq_sta) 2668 { 2669 struct rs_rate *rate = &lq_sta->optimal_rate; 2670 2671 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2672 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2673 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2674 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2675 else if (lq_sta->band == NL80211_BAND_5GHZ) 2676 rate->type = LQ_LEGACY_A; 2677 else 2678 rate->type = LQ_LEGACY_G; 2679 2680 rate->bw = rs_bw_from_sta_bw(sta); 2681 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2682 2683 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2684 2685 if (is_mimo(rate)) { 2686 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2687 } else if (is_siso(rate)) { 2688 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2689 } else { 2690 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2691 2692 if (lq_sta->band == NL80211_BAND_5GHZ) { 2693 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2694 lq_sta->optimal_nentries = 2695 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2696 } else { 2697 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2698 lq_sta->optimal_nentries = 2699 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2700 } 2701 } 2702 2703 if (is_vht(rate)) { 2704 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2705 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2706 lq_sta->optimal_nentries = 2707 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2708 } else { 2709 lq_sta->optimal_rates = rs_optimal_rates_vht; 2710 lq_sta->optimal_nentries = 2711 ARRAY_SIZE(rs_optimal_rates_vht); 2712 } 2713 } else if (is_ht(rate)) { 2714 lq_sta->optimal_rates = rs_optimal_rates_ht; 2715 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2716 } 2717 } 2718 2719 /* Compute the optimal rate index based on RSSI */ 2720 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2721 struct iwl_lq_sta *lq_sta) 2722 { 2723 struct rs_rate *rate = &lq_sta->optimal_rate; 2724 int i; 2725 2726 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2727 BITS_PER_LONG); 2728 2729 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2730 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2731 2732 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2733 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2734 rate->index = rate_idx; 2735 break; 2736 } 2737 } 2738 2739 return rate; 2740 } 2741 2742 /* Choose an initial legacy rate and antenna to use based on the RSSI 2743 * of last Rx 2744 */ 2745 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2746 struct ieee80211_sta *sta, 2747 struct iwl_lq_sta *lq_sta, 2748 enum nl80211_band band, 2749 struct rs_rate *rate) 2750 { 2751 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2752 int i, nentries; 2753 unsigned long active_rate; 2754 s8 best_rssi = S8_MIN; 2755 u8 best_ant = ANT_NONE; 2756 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2757 const struct rs_init_rate_info *initial_rates; 2758 2759 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2760 if (!(lq_sta->pers.chains & BIT(i))) 2761 continue; 2762 2763 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2764 best_rssi = lq_sta->pers.chain_signal[i]; 2765 best_ant = BIT(i); 2766 } 2767 } 2768 2769 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2770 rs_pretty_ant(best_ant), best_rssi); 2771 2772 if (best_ant != ANT_A && best_ant != ANT_B) 2773 rate->ant = first_antenna(valid_tx_ant); 2774 else 2775 rate->ant = best_ant; 2776 2777 rate->sgi = false; 2778 rate->ldpc = false; 2779 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2780 2781 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2782 BITS_PER_LONG); 2783 2784 if (band == NL80211_BAND_5GHZ) { 2785 rate->type = LQ_LEGACY_A; 2786 initial_rates = rs_optimal_rates_5ghz_legacy; 2787 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2788 } else { 2789 rate->type = LQ_LEGACY_G; 2790 initial_rates = rs_optimal_rates_24ghz_legacy; 2791 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2792 } 2793 2794 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2795 goto out; 2796 2797 /* Start from a higher rate if the corresponding debug capability 2798 * is enabled. The rate is chosen according to AP capabilities. 2799 * In case of VHT/HT when the rssi is low fallback to the case of 2800 * legacy rates. 2801 */ 2802 if (sta->vht_cap.vht_supported && 2803 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2804 /* 2805 * In AP mode, when a new station associates, rs is initialized 2806 * immediately upon association completion, before the phy 2807 * context is updated with the association parameters, so the 2808 * sta bandwidth might be wider than the phy context allows. 2809 * To avoid this issue, always initialize rs with 20mhz 2810 * bandwidth rate, and after authorization, when the phy context 2811 * is already up-to-date, re-init rs with the correct bw. 2812 */ 2813 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2814 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2815 2816 switch (bw) { 2817 case RATE_MCS_CHAN_WIDTH_40: 2818 case RATE_MCS_CHAN_WIDTH_80: 2819 case RATE_MCS_CHAN_WIDTH_160: 2820 initial_rates = rs_optimal_rates_vht; 2821 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2822 break; 2823 case RATE_MCS_CHAN_WIDTH_20: 2824 initial_rates = rs_optimal_rates_vht_20mhz; 2825 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2826 break; 2827 default: 2828 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2829 goto out; 2830 } 2831 2832 active_rate = lq_sta->active_siso_rate; 2833 rate->type = LQ_VHT_SISO; 2834 rate->bw = bw; 2835 } else if (sta->ht_cap.ht_supported && 2836 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2837 initial_rates = rs_optimal_rates_ht; 2838 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2839 active_rate = lq_sta->active_siso_rate; 2840 rate->type = LQ_HT_SISO; 2841 } else { 2842 active_rate = lq_sta->active_legacy_rate; 2843 } 2844 2845 for (i = 0; i < nentries; i++) { 2846 int rate_idx = initial_rates[i].rate_idx; 2847 2848 if ((best_rssi >= initial_rates[i].rssi) && 2849 (BIT(rate_idx) & active_rate)) { 2850 rate->index = rate_idx; 2851 break; 2852 } 2853 } 2854 2855 out: 2856 rs_dump_rate(mvm, rate, "INITIAL"); 2857 } 2858 2859 /* Save info about RSSI of last Rx */ 2860 void rs_update_last_rssi(struct iwl_mvm *mvm, 2861 struct iwl_mvm_sta *mvmsta, 2862 struct ieee80211_rx_status *rx_status) 2863 { 2864 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2865 int i; 2866 2867 lq_sta->pers.chains = rx_status->chains; 2868 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2869 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2870 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2871 lq_sta->pers.last_rssi = S8_MIN; 2872 2873 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2874 if (!(lq_sta->pers.chains & BIT(i))) 2875 continue; 2876 2877 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2878 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2879 } 2880 } 2881 2882 /** 2883 * rs_initialize_lq - Initialize a station's hardware rate table 2884 * 2885 * The uCode's station table contains a table of fallback rates 2886 * for automatic fallback during transmission. 2887 * 2888 * NOTE: This sets up a default set of values. These will be replaced later 2889 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2890 * rc80211_simple. 2891 * 2892 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2893 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2894 * which requires station table entry to exist). 2895 */ 2896 static void rs_initialize_lq(struct iwl_mvm *mvm, 2897 struct ieee80211_sta *sta, 2898 struct iwl_lq_sta *lq_sta, 2899 enum nl80211_band band, bool update) 2900 { 2901 struct iwl_scale_tbl_info *tbl; 2902 struct rs_rate *rate; 2903 u8 active_tbl = 0; 2904 2905 if (!sta || !lq_sta) 2906 return; 2907 2908 if (!lq_sta->search_better_tbl) 2909 active_tbl = lq_sta->active_tbl; 2910 else 2911 active_tbl = 1 - lq_sta->active_tbl; 2912 2913 tbl = &(lq_sta->lq_info[active_tbl]); 2914 rate = &tbl->rate; 2915 2916 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2917 rs_init_optimal_rate(mvm, sta, lq_sta); 2918 2919 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2920 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2921 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2922 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2923 2924 tbl->column = rs_get_column_from_rate(rate); 2925 2926 rs_set_expected_tpt_table(lq_sta, tbl); 2927 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2928 /* TODO restore station should remember the lq cmd */ 2929 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update); 2930 } 2931 2932 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2933 void *mvm_sta, 2934 struct ieee80211_tx_rate_control *txrc) 2935 { 2936 struct iwl_op_mode *op_mode = mvm_r; 2937 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2938 struct sk_buff *skb = txrc->skb; 2939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2940 struct iwl_lq_sta *lq_sta; 2941 struct rs_rate *optimal_rate; 2942 u32 last_ucode_rate; 2943 2944 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2945 /* if vif isn't initialized mvm doesn't know about 2946 * this station, so don't do anything with the it 2947 */ 2948 sta = NULL; 2949 mvm_sta = NULL; 2950 } 2951 2952 /* Send management frames and NO_ACK data using lowest rate. */ 2953 if (rate_control_send_low(sta, mvm_sta, txrc)) 2954 return; 2955 2956 if (!mvm_sta) 2957 return; 2958 2959 lq_sta = mvm_sta; 2960 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2961 info->band, &info->control.rates[0]); 2962 info->control.rates[0].count = 1; 2963 2964 /* Report the optimal rate based on rssi and STA caps if we haven't 2965 * converged yet (too little traffic) or exploring other modulations 2966 */ 2967 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2968 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2969 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2970 optimal_rate); 2971 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2972 &txrc->reported_rate); 2973 } 2974 } 2975 2976 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2977 gfp_t gfp) 2978 { 2979 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2980 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2981 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2982 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2983 2984 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2985 2986 lq_sta->pers.drv = mvm; 2987 #ifdef CONFIG_MAC80211_DEBUGFS 2988 lq_sta->pers.dbg_fixed_rate = 0; 2989 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2990 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2991 #endif 2992 lq_sta->pers.chains = 0; 2993 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2994 lq_sta->pers.last_rssi = S8_MIN; 2995 2996 return lq_sta; 2997 } 2998 2999 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 3000 int nss) 3001 { 3002 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 3003 (0x3 << (2 * (nss - 1))); 3004 rx_mcs >>= (2 * (nss - 1)); 3005 3006 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 3007 return IWL_RATE_MCS_7_INDEX; 3008 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 3009 return IWL_RATE_MCS_8_INDEX; 3010 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 3011 return IWL_RATE_MCS_9_INDEX; 3012 3013 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 3014 return -1; 3015 } 3016 3017 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 3018 struct ieee80211_sta_vht_cap *vht_cap, 3019 struct iwl_lq_sta *lq_sta) 3020 { 3021 int i; 3022 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 3023 3024 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 3025 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 3026 if (i == IWL_RATE_9M_INDEX) 3027 continue; 3028 3029 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 3030 if (i == IWL_RATE_MCS_9_INDEX && 3031 sta->bandwidth == IEEE80211_STA_RX_BW_20) 3032 continue; 3033 3034 lq_sta->active_siso_rate |= BIT(i); 3035 } 3036 } 3037 3038 if (sta->rx_nss < 2) 3039 return; 3040 3041 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 3042 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 3043 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 3044 if (i == IWL_RATE_9M_INDEX) 3045 continue; 3046 3047 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 3048 if (i == IWL_RATE_MCS_9_INDEX && 3049 sta->bandwidth == IEEE80211_STA_RX_BW_20) 3050 continue; 3051 3052 lq_sta->active_mimo2_rate |= BIT(i); 3053 } 3054 } 3055 } 3056 3057 static void rs_ht_init(struct iwl_mvm *mvm, 3058 struct ieee80211_sta *sta, 3059 struct iwl_lq_sta *lq_sta, 3060 struct ieee80211_sta_ht_cap *ht_cap) 3061 { 3062 /* active_siso_rate mask includes 9 MBits (bit 5), 3063 * and CCK (bits 0-3), supp_rates[] does not; 3064 * shift to convert format, force 9 MBits off. 3065 */ 3066 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3067 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3068 lq_sta->active_siso_rate &= ~((u16)0x2); 3069 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3070 3071 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3072 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3073 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3074 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3075 3076 if (mvm->cfg->ht_params->ldpc && 3077 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3078 lq_sta->ldpc = true; 3079 3080 if (mvm->cfg->ht_params->stbc && 3081 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3082 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3083 lq_sta->stbc_capable = true; 3084 3085 lq_sta->is_vht = false; 3086 } 3087 3088 static void rs_vht_init(struct iwl_mvm *mvm, 3089 struct ieee80211_sta *sta, 3090 struct iwl_lq_sta *lq_sta, 3091 struct ieee80211_sta_vht_cap *vht_cap) 3092 { 3093 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3094 3095 if (mvm->cfg->ht_params->ldpc && 3096 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3097 lq_sta->ldpc = true; 3098 3099 if (mvm->cfg->ht_params->stbc && 3100 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3101 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3102 lq_sta->stbc_capable = true; 3103 3104 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3105 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3106 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3107 lq_sta->bfer_capable = true; 3108 3109 lq_sta->is_vht = true; 3110 } 3111 3112 #ifdef CONFIG_IWLWIFI_DEBUGFS 3113 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3114 { 3115 spin_lock_bh(&mvm->drv_stats_lock); 3116 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3117 spin_unlock_bh(&mvm->drv_stats_lock); 3118 } 3119 3120 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3121 { 3122 u8 nss = 0; 3123 3124 spin_lock(&mvm->drv_stats_lock); 3125 3126 if (agg) 3127 mvm->drv_rx_stats.agg_frames++; 3128 3129 mvm->drv_rx_stats.success_frames++; 3130 3131 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3132 case RATE_MCS_CHAN_WIDTH_20: 3133 mvm->drv_rx_stats.bw_20_frames++; 3134 break; 3135 case RATE_MCS_CHAN_WIDTH_40: 3136 mvm->drv_rx_stats.bw_40_frames++; 3137 break; 3138 case RATE_MCS_CHAN_WIDTH_80: 3139 mvm->drv_rx_stats.bw_80_frames++; 3140 break; 3141 case RATE_MCS_CHAN_WIDTH_160: 3142 mvm->drv_rx_stats.bw_160_frames++; 3143 break; 3144 default: 3145 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3146 } 3147 3148 if (rate & RATE_MCS_HT_MSK) { 3149 mvm->drv_rx_stats.ht_frames++; 3150 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3151 } else if (rate & RATE_MCS_VHT_MSK) { 3152 mvm->drv_rx_stats.vht_frames++; 3153 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3154 RATE_VHT_MCS_NSS_POS) + 1; 3155 } else { 3156 mvm->drv_rx_stats.legacy_frames++; 3157 } 3158 3159 if (nss == 1) 3160 mvm->drv_rx_stats.siso_frames++; 3161 else if (nss == 2) 3162 mvm->drv_rx_stats.mimo2_frames++; 3163 3164 if (rate & RATE_MCS_SGI_MSK) 3165 mvm->drv_rx_stats.sgi_frames++; 3166 else 3167 mvm->drv_rx_stats.ngi_frames++; 3168 3169 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3170 mvm->drv_rx_stats.last_frame_idx = 3171 (mvm->drv_rx_stats.last_frame_idx + 1) % 3172 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3173 3174 spin_unlock(&mvm->drv_stats_lock); 3175 } 3176 #endif 3177 3178 /* 3179 * Called after adding a new station to initialize rate scaling 3180 */ 3181 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3182 enum nl80211_band band, bool update) 3183 { 3184 int i, j; 3185 struct ieee80211_hw *hw = mvm->hw; 3186 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3187 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3188 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3189 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3190 struct ieee80211_supported_band *sband; 3191 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3192 3193 /* clear all non-persistent lq data */ 3194 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3195 3196 sband = hw->wiphy->bands[band]; 3197 3198 lq_sta->lq.sta_id = mvmsta->sta_id; 3199 mvmsta->amsdu_enabled = 0; 3200 mvmsta->max_amsdu_len = sta->max_amsdu_len; 3201 3202 for (j = 0; j < LQ_SIZE; j++) 3203 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3204 3205 lq_sta->flush_timer = 0; 3206 lq_sta->last_tx = jiffies; 3207 3208 IWL_DEBUG_RATE(mvm, 3209 "LQ: *** rate scale station global init for station %d ***\n", 3210 mvmsta->sta_id); 3211 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3212 * the lowest or the highest rate.. Could consider using RSSI from 3213 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3214 * after assoc.. */ 3215 3216 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3217 lq_sta->band = sband->band; 3218 /* 3219 * active legacy rates as per supported rates bitmap 3220 */ 3221 supp = sta->supp_rates[sband->band]; 3222 lq_sta->active_legacy_rate = 0; 3223 for_each_set_bit(i, &supp, BITS_PER_LONG) 3224 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3225 3226 /* TODO: should probably account for rx_highest for both HT/VHT */ 3227 if (!vht_cap || !vht_cap->vht_supported) 3228 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3229 else 3230 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3231 3232 lq_sta->max_legacy_rate_idx = 3233 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3234 lq_sta->max_siso_rate_idx = 3235 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3236 lq_sta->max_mimo2_rate_idx = 3237 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3238 3239 IWL_DEBUG_RATE(mvm, 3240 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3241 lq_sta->active_legacy_rate, 3242 lq_sta->active_siso_rate, 3243 lq_sta->active_mimo2_rate, 3244 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3245 lq_sta->bfer_capable); 3246 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3247 lq_sta->max_legacy_rate_idx, 3248 lq_sta->max_siso_rate_idx, 3249 lq_sta->max_mimo2_rate_idx); 3250 3251 /* These values will be overridden later */ 3252 lq_sta->lq.single_stream_ant_msk = 3253 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3254 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3255 3256 /* as default allow aggregation for all tids */ 3257 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3258 lq_sta->is_agg = 0; 3259 #ifdef CONFIG_IWLWIFI_DEBUGFS 3260 iwl_mvm_reset_frame_stats(mvm); 3261 #endif 3262 rs_initialize_lq(mvm, sta, lq_sta, band, update); 3263 } 3264 3265 static void rs_drv_rate_update(void *mvm_r, 3266 struct ieee80211_supported_band *sband, 3267 struct cfg80211_chan_def *chandef, 3268 struct ieee80211_sta *sta, 3269 void *priv_sta, u32 changed) 3270 { 3271 struct iwl_op_mode *op_mode = mvm_r; 3272 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3273 u8 tid; 3274 3275 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3276 return; 3277 3278 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3279 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3280 ieee80211_stop_tx_ba_session(sta, tid); 3281 3282 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3283 } 3284 3285 #ifdef CONFIG_MAC80211_DEBUGFS 3286 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3287 struct iwl_lq_cmd *lq_cmd, 3288 enum nl80211_band band, 3289 u32 ucode_rate) 3290 { 3291 struct rs_rate rate; 3292 int i; 3293 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3294 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3295 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3296 3297 for (i = 0; i < num_rates; i++) 3298 lq_cmd->rs_table[i] = ucode_rate_le32; 3299 3300 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3301 WARN_ON_ONCE(1); 3302 return; 3303 } 3304 3305 if (is_mimo(&rate)) 3306 lq_cmd->mimo_delim = num_rates - 1; 3307 else 3308 lq_cmd->mimo_delim = 0; 3309 3310 lq_cmd->reduced_tpc = 0; 3311 3312 if (num_of_ant(ant) == 1) 3313 lq_cmd->single_stream_ant_msk = ant; 3314 3315 if (!mvm->trans->cfg->gen2) 3316 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3317 else 3318 lq_cmd->agg_frame_cnt_limit = 3319 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3320 } 3321 #endif /* CONFIG_MAC80211_DEBUGFS */ 3322 3323 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3324 struct iwl_lq_sta *lq_sta, 3325 struct rs_rate *rate, 3326 __le32 *rs_table, int *rs_table_index, 3327 int num_rates, int num_retries, 3328 u8 valid_tx_ant, bool toggle_ant) 3329 { 3330 int i, j; 3331 __le32 ucode_rate; 3332 bool bottom_reached = false; 3333 int prev_rate_idx = rate->index; 3334 int end = LINK_QUAL_MAX_RETRY_NUM; 3335 int index = *rs_table_index; 3336 3337 for (i = 0; i < num_rates && index < end; i++) { 3338 for (j = 0; j < num_retries && index < end; j++, index++) { 3339 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3340 rate)); 3341 rs_table[index] = ucode_rate; 3342 if (toggle_ant) 3343 rs_toggle_antenna(valid_tx_ant, rate); 3344 } 3345 3346 prev_rate_idx = rate->index; 3347 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3348 if (bottom_reached && !is_legacy(rate)) 3349 break; 3350 } 3351 3352 if (!bottom_reached && !is_legacy(rate)) 3353 rate->index = prev_rate_idx; 3354 3355 *rs_table_index = index; 3356 } 3357 3358 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3359 * column the rate table should look like this: 3360 * 3361 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3362 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3363 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3364 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3365 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3366 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3367 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3368 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3369 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3370 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3371 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3372 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3373 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3374 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3375 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3376 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3377 */ 3378 static void rs_build_rates_table(struct iwl_mvm *mvm, 3379 struct ieee80211_sta *sta, 3380 struct iwl_lq_sta *lq_sta, 3381 const struct rs_rate *initial_rate) 3382 { 3383 struct rs_rate rate; 3384 int num_rates, num_retries, index = 0; 3385 u8 valid_tx_ant = 0; 3386 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3387 bool toggle_ant = false; 3388 u32 color; 3389 3390 memcpy(&rate, initial_rate, sizeof(rate)); 3391 3392 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3393 3394 /* TODO: remove old API when min FW API hits 14 */ 3395 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3396 rs_stbc_allow(mvm, sta, lq_sta)) 3397 rate.stbc = true; 3398 3399 if (is_siso(&rate)) { 3400 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3401 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3402 } else if (is_mimo(&rate)) { 3403 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3404 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3405 } else { 3406 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3407 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3408 toggle_ant = true; 3409 } 3410 3411 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3412 num_rates, num_retries, valid_tx_ant, 3413 toggle_ant); 3414 3415 rs_get_lower_rate_down_column(lq_sta, &rate); 3416 3417 if (is_siso(&rate)) { 3418 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3419 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3420 lq_cmd->mimo_delim = index; 3421 } else if (is_legacy(&rate)) { 3422 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3423 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3424 } else { 3425 WARN_ON_ONCE(1); 3426 } 3427 3428 toggle_ant = true; 3429 3430 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3431 num_rates, num_retries, valid_tx_ant, 3432 toggle_ant); 3433 3434 rs_get_lower_rate_down_column(lq_sta, &rate); 3435 3436 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3437 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3438 3439 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3440 num_rates, num_retries, valid_tx_ant, 3441 toggle_ant); 3442 3443 /* update the color of the LQ command (as a counter at bits 1-3) */ 3444 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3445 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3446 } 3447 3448 struct rs_bfer_active_iter_data { 3449 struct ieee80211_sta *exclude_sta; 3450 struct iwl_mvm_sta *bfer_mvmsta; 3451 }; 3452 3453 static void rs_bfer_active_iter(void *_data, 3454 struct ieee80211_sta *sta) 3455 { 3456 struct rs_bfer_active_iter_data *data = _data; 3457 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3458 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3459 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3460 3461 if (sta == data->exclude_sta) 3462 return; 3463 3464 /* The current sta has BFER allowed */ 3465 if (ss_params & LQ_SS_BFER_ALLOWED) { 3466 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3467 3468 data->bfer_mvmsta = mvmsta; 3469 } 3470 } 3471 3472 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3473 { 3474 int prio = -1; 3475 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3476 3477 switch (viftype) { 3478 case NL80211_IFTYPE_AP: 3479 case NL80211_IFTYPE_P2P_GO: 3480 prio = 3; 3481 break; 3482 case NL80211_IFTYPE_P2P_CLIENT: 3483 prio = 2; 3484 break; 3485 case NL80211_IFTYPE_STATION: 3486 prio = 1; 3487 break; 3488 default: 3489 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3490 prio = -1; 3491 } 3492 3493 return prio; 3494 } 3495 3496 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3497 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3498 struct iwl_mvm_sta *sta2) 3499 { 3500 int prio1 = rs_bfer_priority(sta1); 3501 int prio2 = rs_bfer_priority(sta2); 3502 3503 if (prio1 > prio2) 3504 return 1; 3505 if (prio1 < prio2) 3506 return -1; 3507 return 0; 3508 } 3509 3510 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3511 struct ieee80211_sta *sta, 3512 struct iwl_lq_sta *lq_sta, 3513 const struct rs_rate *initial_rate) 3514 { 3515 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3516 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3517 struct rs_bfer_active_iter_data data = { 3518 .exclude_sta = sta, 3519 .bfer_mvmsta = NULL, 3520 }; 3521 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3522 u32 ss_params = LQ_SS_PARAMS_VALID; 3523 3524 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3525 goto out; 3526 3527 #ifdef CONFIG_MAC80211_DEBUGFS 3528 /* Check if forcing the decision is configured. 3529 * Note that SISO is forced by not allowing STBC or BFER 3530 */ 3531 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3532 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3533 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3534 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3535 3536 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3537 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3538 lq_sta->pers.ss_force); 3539 goto out; 3540 } 3541 #endif 3542 3543 if (lq_sta->stbc_capable) 3544 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3545 3546 if (!lq_sta->bfer_capable) 3547 goto out; 3548 3549 ieee80211_iterate_stations_atomic(mvm->hw, 3550 rs_bfer_active_iter, 3551 &data); 3552 bfer_mvmsta = data.bfer_mvmsta; 3553 3554 /* This code is safe as it doesn't run concurrently for different 3555 * stations. This is guaranteed by the fact that calls to 3556 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3557 */ 3558 if (!bfer_mvmsta) { 3559 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3560 3561 ss_params |= LQ_SS_BFER_ALLOWED; 3562 goto out; 3563 } 3564 3565 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3566 bfer_mvmsta->sta_id); 3567 3568 /* Disallow BFER on another STA if active and we're a higher priority */ 3569 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3570 struct iwl_lq_cmd *bfersta_lq_cmd = 3571 &bfer_mvmsta->lq_sta.rs_drv.lq; 3572 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3573 3574 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3575 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3576 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3577 3578 ss_params |= LQ_SS_BFER_ALLOWED; 3579 IWL_DEBUG_RATE(mvm, 3580 "Lower priority BFER sta found (%d). Switch BFER\n", 3581 bfer_mvmsta->sta_id); 3582 } 3583 out: 3584 lq_cmd->ss_params = cpu_to_le32(ss_params); 3585 } 3586 3587 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3588 struct ieee80211_sta *sta, 3589 struct iwl_lq_sta *lq_sta, 3590 const struct rs_rate *initial_rate) 3591 { 3592 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3593 struct iwl_mvm_sta *mvmsta; 3594 struct iwl_mvm_vif *mvmvif; 3595 3596 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3597 lq_cmd->agg_time_limit = 3598 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3599 3600 #ifdef CONFIG_MAC80211_DEBUGFS 3601 if (lq_sta->pers.dbg_fixed_rate) { 3602 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3603 lq_sta->band, 3604 lq_sta->pers.dbg_fixed_rate); 3605 return; 3606 } 3607 #endif 3608 if (WARN_ON_ONCE(!sta || !initial_rate)) 3609 return; 3610 3611 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3612 3613 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3614 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3615 3616 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3617 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3618 3619 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3620 num_of_ant(initial_rate->ant) == 1) 3621 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3622 3623 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3624 3625 /* 3626 * In case of low latency, tell the firmware to leave a frame in the 3627 * Tx Fifo so that it can start a transaction in the same TxOP. This 3628 * basically allows the firmware to send bursts. 3629 */ 3630 if (iwl_mvm_vif_low_latency(mvmvif)) 3631 lq_cmd->agg_frame_cnt_limit--; 3632 3633 if (mvmsta->vif->p2p) 3634 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3635 3636 lq_cmd->agg_time_limit = 3637 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3638 } 3639 3640 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3641 { 3642 return hw->priv; 3643 } 3644 3645 /* rate scale requires free function to be implemented */ 3646 static void rs_free(void *mvm_rate) 3647 { 3648 return; 3649 } 3650 3651 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3652 { 3653 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3654 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3655 3656 IWL_DEBUG_RATE(mvm, "enter\n"); 3657 IWL_DEBUG_RATE(mvm, "leave\n"); 3658 } 3659 3660 #ifdef CONFIG_MAC80211_DEBUGFS 3661 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3662 { 3663 3664 char *type, *bw; 3665 u8 mcs = 0, nss = 0; 3666 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3667 3668 if (!(rate & RATE_MCS_HT_MSK) && 3669 !(rate & RATE_MCS_VHT_MSK) && 3670 !(rate & RATE_MCS_HE_MSK)) { 3671 int index = iwl_hwrate_to_plcp_idx(rate); 3672 3673 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3674 rs_pretty_ant(ant), 3675 index == IWL_RATE_INVALID ? "BAD" : 3676 iwl_rate_mcs[index].mbps); 3677 } 3678 3679 if (rate & RATE_MCS_VHT_MSK) { 3680 type = "VHT"; 3681 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3682 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3683 >> RATE_VHT_MCS_NSS_POS) + 1; 3684 } else if (rate & RATE_MCS_HT_MSK) { 3685 type = "HT"; 3686 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3687 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3688 >> RATE_HT_MCS_NSS_POS) + 1; 3689 } else if (rate & RATE_MCS_HE_MSK) { 3690 type = "HE"; 3691 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3692 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3693 >> RATE_VHT_MCS_NSS_POS) + 1; 3694 } else { 3695 type = "Unknown"; /* shouldn't happen */ 3696 } 3697 3698 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3699 case RATE_MCS_CHAN_WIDTH_20: 3700 bw = "20Mhz"; 3701 break; 3702 case RATE_MCS_CHAN_WIDTH_40: 3703 bw = "40Mhz"; 3704 break; 3705 case RATE_MCS_CHAN_WIDTH_80: 3706 bw = "80Mhz"; 3707 break; 3708 case RATE_MCS_CHAN_WIDTH_160: 3709 bw = "160Mhz"; 3710 break; 3711 default: 3712 bw = "BAD BW"; 3713 } 3714 3715 return scnprintf(buf, bufsz, 3716 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3717 type, rs_pretty_ant(ant), bw, mcs, nss, 3718 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3719 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3720 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3721 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3722 } 3723 3724 /** 3725 * Program the device to use fixed rate for frame transmit 3726 * This is for debugging/testing only 3727 * once the device start use fixed rate, we need to reload the module 3728 * to being back the normal operation. 3729 */ 3730 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3731 struct iwl_lq_sta *lq_sta) 3732 { 3733 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3734 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3735 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3736 3737 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3738 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3739 3740 if (lq_sta->pers.dbg_fixed_rate) { 3741 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3742 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3743 } 3744 } 3745 3746 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3747 const char __user *user_buf, size_t count, loff_t *ppos) 3748 { 3749 struct iwl_lq_sta *lq_sta = file->private_data; 3750 struct iwl_mvm *mvm; 3751 char buf[64]; 3752 size_t buf_size; 3753 u32 parsed_rate; 3754 3755 mvm = lq_sta->pers.drv; 3756 memset(buf, 0, sizeof(buf)); 3757 buf_size = min(count, sizeof(buf) - 1); 3758 if (copy_from_user(buf, user_buf, buf_size)) 3759 return -EFAULT; 3760 3761 if (sscanf(buf, "%x", &parsed_rate) == 1) 3762 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3763 else 3764 lq_sta->pers.dbg_fixed_rate = 0; 3765 3766 rs_program_fix_rate(mvm, lq_sta); 3767 3768 return count; 3769 } 3770 3771 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3772 char __user *user_buf, size_t count, loff_t *ppos) 3773 { 3774 char *buff; 3775 int desc = 0; 3776 int i = 0; 3777 ssize_t ret; 3778 static const size_t bufsz = 2048; 3779 3780 struct iwl_lq_sta *lq_sta = file->private_data; 3781 struct iwl_mvm_sta *mvmsta = 3782 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3783 struct iwl_mvm *mvm; 3784 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3785 struct rs_rate *rate = &tbl->rate; 3786 u32 ss_params; 3787 3788 mvm = lq_sta->pers.drv; 3789 buff = kmalloc(bufsz, GFP_KERNEL); 3790 if (!buff) 3791 return -ENOMEM; 3792 3793 desc += scnprintf(buff + desc, bufsz - desc, 3794 "sta_id %d\n", lq_sta->lq.sta_id); 3795 desc += scnprintf(buff + desc, bufsz - desc, 3796 "failed=%d success=%d rate=0%lX\n", 3797 lq_sta->total_failed, lq_sta->total_success, 3798 lq_sta->active_legacy_rate); 3799 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3800 lq_sta->pers.dbg_fixed_rate); 3801 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3802 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3803 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3804 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3805 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3806 (is_legacy(rate)) ? "legacy" : 3807 is_vht(rate) ? "VHT" : "HT"); 3808 if (!is_legacy(rate)) { 3809 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3810 (is_siso(rate)) ? "SISO" : "MIMO2"); 3811 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3812 (is_ht20(rate)) ? "20MHz" : 3813 (is_ht40(rate)) ? "40MHz" : 3814 (is_ht80(rate)) ? "80MHz" : 3815 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3816 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3817 (rate->sgi) ? "SGI" : "NGI", 3818 (rate->ldpc) ? "LDPC" : "BCC", 3819 (lq_sta->is_agg) ? "AGG on" : "", 3820 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3821 } 3822 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3823 lq_sta->last_rate_n_flags); 3824 desc += scnprintf(buff + desc, bufsz - desc, 3825 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3826 lq_sta->lq.flags, 3827 lq_sta->lq.mimo_delim, 3828 lq_sta->lq.single_stream_ant_msk, 3829 lq_sta->lq.dual_stream_ant_msk); 3830 3831 desc += scnprintf(buff + desc, bufsz - desc, 3832 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3833 le16_to_cpu(lq_sta->lq.agg_time_limit), 3834 lq_sta->lq.agg_disable_start_th, 3835 lq_sta->lq.agg_frame_cnt_limit); 3836 3837 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3838 lq_sta->lq.reduced_tpc); 3839 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3840 desc += scnprintf(buff + desc, bufsz - desc, 3841 "single stream params: %s%s%s%s\n", 3842 (ss_params & LQ_SS_PARAMS_VALID) ? 3843 "VALID" : "INVALID", 3844 (ss_params & LQ_SS_BFER_ALLOWED) ? 3845 ", BFER" : "", 3846 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3847 ", STBC" : "", 3848 (ss_params & LQ_SS_FORCE) ? 3849 ", FORCE" : ""); 3850 desc += scnprintf(buff + desc, bufsz - desc, 3851 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3852 lq_sta->lq.initial_rate_index[0], 3853 lq_sta->lq.initial_rate_index[1], 3854 lq_sta->lq.initial_rate_index[2], 3855 lq_sta->lq.initial_rate_index[3]); 3856 3857 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3858 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3859 3860 desc += scnprintf(buff + desc, bufsz - desc, 3861 " rate[%d] 0x%X ", i, r); 3862 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3863 } 3864 3865 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3866 kfree(buff); 3867 return ret; 3868 } 3869 3870 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3871 .write = rs_sta_dbgfs_scale_table_write, 3872 .read = rs_sta_dbgfs_scale_table_read, 3873 .open = simple_open, 3874 .llseek = default_llseek, 3875 }; 3876 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3877 char __user *user_buf, size_t count, loff_t *ppos) 3878 { 3879 char *buff; 3880 int desc = 0; 3881 int i, j; 3882 ssize_t ret; 3883 struct iwl_scale_tbl_info *tbl; 3884 struct rs_rate *rate; 3885 struct iwl_lq_sta *lq_sta = file->private_data; 3886 3887 buff = kmalloc(1024, GFP_KERNEL); 3888 if (!buff) 3889 return -ENOMEM; 3890 3891 for (i = 0; i < LQ_SIZE; i++) { 3892 tbl = &(lq_sta->lq_info[i]); 3893 rate = &tbl->rate; 3894 desc += sprintf(buff+desc, 3895 "%s type=%d SGI=%d BW=%s DUP=0\n" 3896 "index=%d\n", 3897 lq_sta->active_tbl == i ? "*" : "x", 3898 rate->type, 3899 rate->sgi, 3900 is_ht20(rate) ? "20MHz" : 3901 is_ht40(rate) ? "40MHz" : 3902 is_ht80(rate) ? "80MHz" : 3903 is_ht160(rate) ? "160MHz" : "ERR", 3904 rate->index); 3905 for (j = 0; j < IWL_RATE_COUNT; j++) { 3906 desc += sprintf(buff+desc, 3907 "counter=%d success=%d %%=%d\n", 3908 tbl->win[j].counter, 3909 tbl->win[j].success_counter, 3910 tbl->win[j].success_ratio); 3911 } 3912 } 3913 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3914 kfree(buff); 3915 return ret; 3916 } 3917 3918 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3919 .read = rs_sta_dbgfs_stats_table_read, 3920 .open = simple_open, 3921 .llseek = default_llseek, 3922 }; 3923 3924 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3925 char __user *user_buf, 3926 size_t count, loff_t *ppos) 3927 { 3928 static const char * const column_name[] = { 3929 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3930 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3931 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3932 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3933 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3934 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3935 [RS_COLUMN_MIMO2] = "MIMO2", 3936 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3937 }; 3938 3939 static const char * const rate_name[] = { 3940 [IWL_RATE_1M_INDEX] = "1M", 3941 [IWL_RATE_2M_INDEX] = "2M", 3942 [IWL_RATE_5M_INDEX] = "5.5M", 3943 [IWL_RATE_11M_INDEX] = "11M", 3944 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3945 [IWL_RATE_9M_INDEX] = "9M", 3946 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3947 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3948 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3949 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3950 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3951 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3952 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3953 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3954 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3955 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3956 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3957 }; 3958 3959 char *buff, *pos, *endpos; 3960 int col, rate; 3961 ssize_t ret; 3962 struct iwl_lq_sta *lq_sta = file->private_data; 3963 struct rs_rate_stats *stats; 3964 static const size_t bufsz = 1024; 3965 3966 buff = kmalloc(bufsz, GFP_KERNEL); 3967 if (!buff) 3968 return -ENOMEM; 3969 3970 pos = buff; 3971 endpos = pos + bufsz; 3972 3973 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3974 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3975 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3976 pos += scnprintf(pos, endpos - pos, "\n"); 3977 3978 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3979 pos += scnprintf(pos, endpos - pos, 3980 "%s,", column_name[col]); 3981 3982 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3983 stats = &(lq_sta->pers.tx_stats[col][rate]); 3984 pos += scnprintf(pos, endpos - pos, 3985 "%llu/%llu,", 3986 stats->success, 3987 stats->total); 3988 } 3989 pos += scnprintf(pos, endpos - pos, "\n"); 3990 } 3991 3992 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3993 kfree(buff); 3994 return ret; 3995 } 3996 3997 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3998 const char __user *user_buf, 3999 size_t count, loff_t *ppos) 4000 { 4001 struct iwl_lq_sta *lq_sta = file->private_data; 4002 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 4003 4004 return count; 4005 } 4006 4007 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 4008 .read = rs_sta_dbgfs_drv_tx_stats_read, 4009 .write = rs_sta_dbgfs_drv_tx_stats_write, 4010 .open = simple_open, 4011 .llseek = default_llseek, 4012 }; 4013 4014 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 4015 char __user *user_buf, 4016 size_t count, loff_t *ppos) 4017 { 4018 struct iwl_lq_sta *lq_sta = file->private_data; 4019 char buf[12]; 4020 int bufsz = sizeof(buf); 4021 int pos = 0; 4022 static const char * const ss_force_name[] = { 4023 [RS_SS_FORCE_NONE] = "none", 4024 [RS_SS_FORCE_STBC] = "stbc", 4025 [RS_SS_FORCE_BFER] = "bfer", 4026 [RS_SS_FORCE_SISO] = "siso", 4027 }; 4028 4029 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4030 ss_force_name[lq_sta->pers.ss_force]); 4031 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4032 } 4033 4034 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4035 size_t count, loff_t *ppos) 4036 { 4037 struct iwl_mvm *mvm = lq_sta->pers.drv; 4038 int ret = 0; 4039 4040 if (!strncmp("none", buf, 4)) { 4041 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4042 } else if (!strncmp("siso", buf, 4)) { 4043 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4044 } else if (!strncmp("stbc", buf, 4)) { 4045 if (lq_sta->stbc_capable) { 4046 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4047 } else { 4048 IWL_ERR(mvm, 4049 "can't force STBC. peer doesn't support\n"); 4050 ret = -EINVAL; 4051 } 4052 } else if (!strncmp("bfer", buf, 4)) { 4053 if (lq_sta->bfer_capable) { 4054 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4055 } else { 4056 IWL_ERR(mvm, 4057 "can't force BFER. peer doesn't support\n"); 4058 ret = -EINVAL; 4059 } 4060 } else { 4061 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4062 ret = -EINVAL; 4063 } 4064 return ret ?: count; 4065 } 4066 4067 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4068 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4069 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4070 debugfs_create_file(#name, mode, parent, lq_sta, \ 4071 &iwl_dbgfs_##name##_ops); \ 4072 } while (0) 4073 4074 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4075 4076 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4077 struct dentry *dir) 4078 { 4079 struct iwl_lq_sta *lq_sta = priv_sta; 4080 struct iwl_mvm_sta *mvmsta; 4081 4082 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4083 4084 if (!mvmsta->vif) 4085 return; 4086 4087 debugfs_create_file("rate_scale_table", 0600, dir, 4088 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4089 debugfs_create_file("rate_stats_table", 0400, dir, 4090 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4091 debugfs_create_file("drv_tx_stats", 0600, dir, 4092 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4093 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4094 &lq_sta->tx_agg_tid_en); 4095 debugfs_create_u8("reduced_tpc", 0600, dir, 4096 &lq_sta->pers.dbg_fixed_txp_reduction); 4097 4098 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4099 } 4100 4101 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta) 4102 { 4103 } 4104 #endif 4105 4106 /* 4107 * Initialization of rate scaling information is done by driver after 4108 * the station is added. Since mac80211 calls this function before a 4109 * station is added we ignore it. 4110 */ 4111 static void rs_rate_init_ops(void *mvm_r, 4112 struct ieee80211_supported_band *sband, 4113 struct cfg80211_chan_def *chandef, 4114 struct ieee80211_sta *sta, void *mvm_sta) 4115 { 4116 } 4117 4118 /* ops for rate scaling implemented in the driver */ 4119 static const struct rate_control_ops rs_mvm_ops_drv = { 4120 .name = RS_NAME, 4121 .tx_status = rs_drv_mac80211_tx_status, 4122 .get_rate = rs_drv_get_rate, 4123 .rate_init = rs_rate_init_ops, 4124 .alloc = rs_alloc, 4125 .free = rs_free, 4126 .alloc_sta = rs_drv_alloc_sta, 4127 .free_sta = rs_free_sta, 4128 .rate_update = rs_drv_rate_update, 4129 #ifdef CONFIG_MAC80211_DEBUGFS 4130 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4131 .remove_sta_debugfs = rs_remove_sta_debugfs, 4132 #endif 4133 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4134 }; 4135 4136 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4137 enum nl80211_band band, bool update) 4138 { 4139 if (iwl_mvm_has_tlc_offload(mvm)) 4140 rs_fw_rate_init(mvm, sta, band, update); 4141 else 4142 rs_drv_rate_init(mvm, sta, band, update); 4143 } 4144 4145 int iwl_mvm_rate_control_register(void) 4146 { 4147 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4148 } 4149 4150 void iwl_mvm_rate_control_unregister(void) 4151 { 4152 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4153 } 4154 4155 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4156 bool enable) 4157 { 4158 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4159 4160 lockdep_assert_held(&mvm->mutex); 4161 4162 if (enable) { 4163 if (mvmsta->tx_protection == 0) 4164 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4165 mvmsta->tx_protection++; 4166 } else { 4167 mvmsta->tx_protection--; 4168 if (mvmsta->tx_protection == 0) 4169 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4170 } 4171 4172 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4173 } 4174 4175 /** 4176 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4177 * @mvmsta: The station 4178 * @enable: Enable Tx protection? 4179 */ 4180 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4181 bool enable) 4182 { 4183 if (iwl_mvm_has_tlc_offload(mvm)) 4184 return rs_fw_tx_protection(mvm, mvmsta, enable); 4185 else 4186 return rs_drv_tx_protection(mvm, mvmsta, enable); 4187 } 4188