Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of version 2 of the GNU General Public License as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA |
| 17 | * |
| 18 | * The full GNU General Public License is included in this distribution in the |
| 19 | * file called LICENSE. |
| 20 | * |
| 21 | * Contact Information: |
| 22 | * Intel Linux Wireless <ilw@linux.intel.com> |
| 23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| 24 | * |
| 25 | *****************************************************************************/ |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/skbuff.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <net/mac80211.h> |
| 31 | |
| 32 | #include <linux/netdevice.h> |
| 33 | #include <linux/etherdevice.h> |
| 34 | #include <linux/delay.h> |
| 35 | |
| 36 | #include <linux/workqueue.h> |
| 37 | #include "rs.h" |
| 38 | #include "fw-api.h" |
| 39 | #include "sta.h" |
| 40 | #include "iwl-op-mode.h" |
| 41 | #include "mvm.h" |
| 42 | |
| 43 | #define RS_NAME "iwl-mvm-rs" |
| 44 | |
| 45 | #define NUM_TRY_BEFORE_ANT_TOGGLE 1 |
| 46 | #define IWL_NUMBER_TRY 1 |
| 47 | #define IWL_HT_NUMBER_TRY 3 |
| 48 | |
| 49 | #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ |
| 50 | #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ |
| 51 | #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ |
| 52 | |
| 53 | /* max allowed rate miss before sync LQ cmd */ |
| 54 | #define IWL_MISSED_RATE_MAX 15 |
| 55 | /* max time to accum history 2 seconds */ |
| 56 | #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ) |
| 57 | |
| 58 | static u8 rs_ht_to_legacy[] = { |
| 59 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, |
| 60 | IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, |
| 61 | IWL_RATE_6M_INDEX, |
| 62 | IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, |
| 63 | IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, |
| 64 | IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, |
| 65 | IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX |
| 66 | }; |
| 67 | |
| 68 | static const u8 ant_toggle_lookup[] = { |
| 69 | /*ANT_NONE -> */ ANT_NONE, |
| 70 | /*ANT_A -> */ ANT_B, |
| 71 | /*ANT_B -> */ ANT_C, |
| 72 | /*ANT_AB -> */ ANT_BC, |
| 73 | /*ANT_C -> */ ANT_A, |
| 74 | /*ANT_AC -> */ ANT_AB, |
| 75 | /*ANT_BC -> */ ANT_AC, |
| 76 | /*ANT_ABC -> */ ANT_ABC, |
| 77 | }; |
| 78 | |
| 79 | #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \ |
| 80 | [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ |
| 81 | IWL_RATE_SISO_##s##M_PLCP, \ |
| 82 | IWL_RATE_MIMO2_##s##M_PLCP,\ |
| 83 | IWL_RATE_MIMO3_##s##M_PLCP,\ |
| 84 | IWL_RATE_##r##M_IEEE, \ |
| 85 | IWL_RATE_##ip##M_INDEX, \ |
| 86 | IWL_RATE_##in##M_INDEX, \ |
| 87 | IWL_RATE_##rp##M_INDEX, \ |
| 88 | IWL_RATE_##rn##M_INDEX, \ |
| 89 | IWL_RATE_##pp##M_INDEX, \ |
| 90 | IWL_RATE_##np##M_INDEX } |
| 91 | |
| 92 | /* |
| 93 | * Parameter order: |
| 94 | * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate |
| 95 | * |
| 96 | * If there isn't a valid next or previous rate then INV is used which |
| 97 | * maps to IWL_RATE_INVALID |
| 98 | * |
| 99 | */ |
| 100 | static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { |
| 101 | IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */ |
| 102 | IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */ |
| 103 | IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */ |
| 104 | IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */ |
| 105 | IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */ |
| 106 | IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */ |
| 107 | IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */ |
| 108 | IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */ |
| 109 | IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */ |
| 110 | IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */ |
| 111 | IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */ |
| 112 | IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */ |
| 113 | IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */ |
| 114 | /* FIXME:RS: ^^ should be INV (legacy) */ |
| 115 | }; |
| 116 | |
| 117 | static inline u8 rs_extract_rate(u32 rate_n_flags) |
| 118 | { |
| 119 | /* also works for HT because bits 7:6 are zero there */ |
| 120 | return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); |
| 121 | } |
| 122 | |
| 123 | static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) |
| 124 | { |
| 125 | int idx = 0; |
| 126 | |
| 127 | /* HT rate format */ |
| 128 | if (rate_n_flags & RATE_MCS_HT_MSK) { |
| 129 | idx = rs_extract_rate(rate_n_flags); |
| 130 | |
| 131 | if (idx >= IWL_RATE_MIMO3_6M_PLCP) |
| 132 | idx = idx - IWL_RATE_MIMO3_6M_PLCP; |
| 133 | else if (idx >= IWL_RATE_MIMO2_6M_PLCP) |
| 134 | idx = idx - IWL_RATE_MIMO2_6M_PLCP; |
| 135 | |
| 136 | idx += IWL_FIRST_OFDM_RATE; |
| 137 | /* skip 9M not supported in ht*/ |
| 138 | if (idx >= IWL_RATE_9M_INDEX) |
| 139 | idx += 1; |
| 140 | if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE)) |
| 141 | return idx; |
| 142 | |
| 143 | /* legacy rate format, search for match in table */ |
| 144 | } else { |
| 145 | for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) |
| 146 | if (iwl_rates[idx].plcp == |
| 147 | rs_extract_rate(rate_n_flags)) |
| 148 | return idx; |
| 149 | } |
| 150 | |
| 151 | return -1; |
| 152 | } |
| 153 | |
| 154 | static void rs_rate_scale_perform(struct iwl_mvm *mvm, |
| 155 | struct sk_buff *skb, |
| 156 | struct ieee80211_sta *sta, |
| 157 | struct iwl_lq_sta *lq_sta); |
| 158 | static void rs_fill_link_cmd(struct iwl_mvm *mvm, |
| 159 | struct iwl_lq_sta *lq_sta, u32 rate_n_flags); |
| 160 | static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); |
| 161 | |
| 162 | |
| 163 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 164 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, |
| 165 | u32 *rate_n_flags, int index); |
| 166 | #else |
| 167 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, |
| 168 | u32 *rate_n_flags, int index) |
| 169 | {} |
| 170 | #endif |
| 171 | |
| 172 | /** |
| 173 | * The following tables contain the expected throughput metrics for all rates |
| 174 | * |
| 175 | * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits |
| 176 | * |
| 177 | * where invalid entries are zeros. |
| 178 | * |
| 179 | * CCK rates are only valid in legacy table and will only be used in G |
| 180 | * (2.4 GHz) band. |
| 181 | */ |
| 182 | |
| 183 | static s32 expected_tpt_legacy[IWL_RATE_COUNT] = { |
| 184 | 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0 |
| 185 | }; |
| 186 | |
| 187 | static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = { |
| 188 | {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */ |
| 189 | {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */ |
| 190 | {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */ |
| 191 | {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */ |
| 192 | }; |
| 193 | |
| 194 | static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = { |
| 195 | {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */ |
| 196 | {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */ |
| 197 | {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */ |
| 198 | {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */ |
| 199 | }; |
| 200 | |
| 201 | static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { |
| 202 | {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */ |
| 203 | {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */ |
| 204 | {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */ |
| 205 | {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/ |
| 206 | }; |
| 207 | |
| 208 | static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { |
| 209 | {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */ |
| 210 | {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */ |
| 211 | {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */ |
| 212 | {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */ |
| 213 | }; |
| 214 | |
| 215 | static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = { |
| 216 | {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */ |
| 217 | {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */ |
| 218 | {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */ |
| 219 | {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */ |
| 220 | }; |
| 221 | |
| 222 | static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = { |
| 223 | {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */ |
| 224 | {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */ |
| 225 | {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */ |
| 226 | {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */ |
| 227 | }; |
| 228 | |
| 229 | /* mbps, mcs */ |
| 230 | static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { |
| 231 | { "1", "BPSK DSSS"}, |
| 232 | { "2", "QPSK DSSS"}, |
| 233 | {"5.5", "BPSK CCK"}, |
| 234 | { "11", "QPSK CCK"}, |
| 235 | { "6", "BPSK 1/2"}, |
| 236 | { "9", "BPSK 1/2"}, |
| 237 | { "12", "QPSK 1/2"}, |
| 238 | { "18", "QPSK 3/4"}, |
| 239 | { "24", "16QAM 1/2"}, |
| 240 | { "36", "16QAM 3/4"}, |
| 241 | { "48", "64QAM 2/3"}, |
| 242 | { "54", "64QAM 3/4"}, |
| 243 | { "60", "64QAM 5/6"}, |
| 244 | }; |
| 245 | |
| 246 | #define MCS_INDEX_PER_STREAM (8) |
| 247 | |
| 248 | static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) |
| 249 | { |
| 250 | window->data = 0; |
| 251 | window->success_counter = 0; |
| 252 | window->success_ratio = IWL_INVALID_VALUE; |
| 253 | window->counter = 0; |
| 254 | window->average_tpt = IWL_INVALID_VALUE; |
| 255 | window->stamp = 0; |
| 256 | } |
| 257 | |
| 258 | static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) |
| 259 | { |
| 260 | return (ant_type & valid_antenna) == ant_type; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * removes the old data from the statistics. All data that is older than |
| 265 | * TID_MAX_TIME_DIFF, will be deleted. |
| 266 | */ |
| 267 | static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) |
| 268 | { |
| 269 | /* The oldest age we want to keep */ |
| 270 | u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; |
| 271 | |
| 272 | while (tl->queue_count && |
| 273 | (tl->time_stamp < oldest_time)) { |
| 274 | tl->total -= tl->packet_count[tl->head]; |
| 275 | tl->packet_count[tl->head] = 0; |
| 276 | tl->time_stamp += TID_QUEUE_CELL_SPACING; |
| 277 | tl->queue_count--; |
| 278 | tl->head++; |
| 279 | if (tl->head >= TID_QUEUE_MAX_SIZE) |
| 280 | tl->head = 0; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * increment traffic load value for tid and also remove |
| 286 | * any old values if passed the certain time period |
| 287 | */ |
| 288 | static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, |
| 289 | struct ieee80211_hdr *hdr) |
| 290 | { |
| 291 | u32 curr_time = jiffies_to_msecs(jiffies); |
| 292 | u32 time_diff; |
| 293 | s32 index; |
| 294 | struct iwl_traffic_load *tl = NULL; |
| 295 | u8 tid; |
| 296 | |
| 297 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
| 298 | u8 *qc = ieee80211_get_qos_ctl(hdr); |
| 299 | tid = qc[0] & 0xf; |
| 300 | } else { |
| 301 | return IWL_MAX_TID_COUNT; |
| 302 | } |
| 303 | |
| 304 | if (unlikely(tid >= IWL_MAX_TID_COUNT)) |
| 305 | return IWL_MAX_TID_COUNT; |
| 306 | |
| 307 | tl = &lq_data->load[tid]; |
| 308 | |
| 309 | curr_time -= curr_time % TID_ROUND_VALUE; |
| 310 | |
| 311 | /* Happens only for the first packet. Initialize the data */ |
| 312 | if (!(tl->queue_count)) { |
| 313 | tl->total = 1; |
| 314 | tl->time_stamp = curr_time; |
| 315 | tl->queue_count = 1; |
| 316 | tl->head = 0; |
| 317 | tl->packet_count[0] = 1; |
| 318 | return IWL_MAX_TID_COUNT; |
| 319 | } |
| 320 | |
| 321 | time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); |
| 322 | index = time_diff / TID_QUEUE_CELL_SPACING; |
| 323 | |
| 324 | /* The history is too long: remove data that is older than */ |
| 325 | /* TID_MAX_TIME_DIFF */ |
| 326 | if (index >= TID_QUEUE_MAX_SIZE) |
| 327 | rs_tl_rm_old_stats(tl, curr_time); |
| 328 | |
| 329 | index = (tl->head + index) % TID_QUEUE_MAX_SIZE; |
| 330 | tl->packet_count[index] = tl->packet_count[index] + 1; |
| 331 | tl->total = tl->total + 1; |
| 332 | |
| 333 | if ((index + 1) > tl->queue_count) |
| 334 | tl->queue_count = index + 1; |
| 335 | |
| 336 | return tid; |
| 337 | } |
| 338 | |
| 339 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 340 | /** |
| 341 | * Program the device to use fixed rate for frame transmit |
| 342 | * This is for debugging/testing only |
| 343 | * once the device start use fixed rate, we need to reload the module |
| 344 | * to being back the normal operation. |
| 345 | */ |
| 346 | static void rs_program_fix_rate(struct iwl_mvm *mvm, |
| 347 | struct iwl_lq_sta *lq_sta) |
| 348 | { |
| 349 | lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ |
| 350 | lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ |
| 351 | lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ |
| 352 | lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ |
| 353 | |
| 354 | IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", |
| 355 | lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); |
| 356 | |
| 357 | if (lq_sta->dbg_fixed_rate) { |
| 358 | rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); |
| 359 | iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false); |
| 360 | } |
| 361 | } |
| 362 | #endif |
| 363 | |
| 364 | /* |
| 365 | get the traffic load value for tid |
| 366 | */ |
| 367 | static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) |
| 368 | { |
| 369 | u32 curr_time = jiffies_to_msecs(jiffies); |
| 370 | u32 time_diff; |
| 371 | s32 index; |
| 372 | struct iwl_traffic_load *tl = NULL; |
| 373 | |
| 374 | if (tid >= IWL_MAX_TID_COUNT) |
| 375 | return 0; |
| 376 | |
| 377 | tl = &(lq_data->load[tid]); |
| 378 | |
| 379 | curr_time -= curr_time % TID_ROUND_VALUE; |
| 380 | |
| 381 | if (!(tl->queue_count)) |
| 382 | return 0; |
| 383 | |
| 384 | time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); |
| 385 | index = time_diff / TID_QUEUE_CELL_SPACING; |
| 386 | |
| 387 | /* The history is too long: remove data that is older than */ |
| 388 | /* TID_MAX_TIME_DIFF */ |
| 389 | if (index >= TID_QUEUE_MAX_SIZE) |
| 390 | rs_tl_rm_old_stats(tl, curr_time); |
| 391 | |
| 392 | return tl->total; |
| 393 | } |
| 394 | |
| 395 | static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, |
| 396 | struct iwl_lq_sta *lq_data, u8 tid, |
| 397 | struct ieee80211_sta *sta) |
| 398 | { |
| 399 | int ret = -EAGAIN; |
| 400 | u32 load; |
| 401 | |
| 402 | load = rs_tl_get_load(lq_data, tid); |
| 403 | |
| 404 | if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) { |
| 405 | IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", |
| 406 | sta->addr, tid); |
| 407 | ret = ieee80211_start_tx_ba_session(sta, tid, 5000); |
| 408 | if (ret == -EAGAIN) { |
| 409 | /* |
| 410 | * driver and mac80211 is out of sync |
| 411 | * this might be cause by reloading firmware |
| 412 | * stop the tx ba session here |
| 413 | */ |
| 414 | IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", |
| 415 | tid); |
| 416 | ieee80211_stop_tx_ba_session(sta, tid); |
| 417 | } |
| 418 | } else { |
| 419 | IWL_DEBUG_HT(mvm, |
| 420 | "Aggregation not enabled for tid %d because load = %u\n", |
| 421 | tid, load); |
| 422 | } |
| 423 | return ret; |
| 424 | } |
| 425 | |
| 426 | static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, |
| 427 | struct iwl_lq_sta *lq_data, |
| 428 | struct ieee80211_sta *sta) |
| 429 | { |
| 430 | if (tid < IWL_MAX_TID_COUNT) |
| 431 | rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); |
| 432 | else |
| 433 | IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", |
| 434 | tid, IWL_MAX_TID_COUNT); |
| 435 | } |
| 436 | |
| 437 | static inline int get_num_of_ant_from_rate(u32 rate_n_flags) |
| 438 | { |
| 439 | return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + |
| 440 | !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + |
| 441 | !!(rate_n_flags & RATE_MCS_ANT_C_MSK); |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Static function to get the expected throughput from an iwl_scale_tbl_info |
| 446 | * that wraps a NULL pointer check |
| 447 | */ |
| 448 | static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) |
| 449 | { |
| 450 | if (tbl->expected_tpt) |
| 451 | return tbl->expected_tpt[rs_index]; |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * rs_collect_tx_data - Update the success/failure sliding window |
| 457 | * |
| 458 | * We keep a sliding window of the last 62 packets transmitted |
| 459 | * at this rate. window->data contains the bitmask of successful |
| 460 | * packets. |
| 461 | */ |
| 462 | static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl, |
| 463 | int scale_index, int attempts, int successes) |
| 464 | { |
| 465 | struct iwl_rate_scale_data *window = NULL; |
| 466 | static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); |
| 467 | s32 fail_count, tpt; |
| 468 | |
| 469 | if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) |
| 470 | return -EINVAL; |
| 471 | |
| 472 | /* Select window for current tx bit rate */ |
| 473 | window = &(tbl->win[scale_index]); |
| 474 | |
| 475 | /* Get expected throughput */ |
| 476 | tpt = get_expected_tpt(tbl, scale_index); |
| 477 | |
| 478 | /* |
| 479 | * Keep track of only the latest 62 tx frame attempts in this rate's |
| 480 | * history window; anything older isn't really relevant any more. |
| 481 | * If we have filled up the sliding window, drop the oldest attempt; |
| 482 | * if the oldest attempt (highest bit in bitmap) shows "success", |
| 483 | * subtract "1" from the success counter (this is the main reason |
| 484 | * we keep these bitmaps!). |
| 485 | */ |
| 486 | while (attempts > 0) { |
| 487 | if (window->counter >= IWL_RATE_MAX_WINDOW) { |
| 488 | /* remove earliest */ |
| 489 | window->counter = IWL_RATE_MAX_WINDOW - 1; |
| 490 | |
| 491 | if (window->data & mask) { |
| 492 | window->data &= ~mask; |
| 493 | window->success_counter--; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* Increment frames-attempted counter */ |
| 498 | window->counter++; |
| 499 | |
| 500 | /* Shift bitmap by one frame to throw away oldest history */ |
| 501 | window->data <<= 1; |
| 502 | |
| 503 | /* Mark the most recent #successes attempts as successful */ |
| 504 | if (successes > 0) { |
| 505 | window->success_counter++; |
| 506 | window->data |= 0x1; |
| 507 | successes--; |
| 508 | } |
| 509 | |
| 510 | attempts--; |
| 511 | } |
| 512 | |
| 513 | /* Calculate current success ratio, avoid divide-by-0! */ |
| 514 | if (window->counter > 0) |
| 515 | window->success_ratio = 128 * (100 * window->success_counter) |
| 516 | / window->counter; |
| 517 | else |
| 518 | window->success_ratio = IWL_INVALID_VALUE; |
| 519 | |
| 520 | fail_count = window->counter - window->success_counter; |
| 521 | |
| 522 | /* Calculate average throughput, if we have enough history. */ |
| 523 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || |
| 524 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) |
| 525 | window->average_tpt = (window->success_ratio * tpt + 64) / 128; |
| 526 | else |
| 527 | window->average_tpt = IWL_INVALID_VALUE; |
| 528 | |
| 529 | /* Tag this window as having been updated */ |
| 530 | window->stamp = jiffies; |
| 531 | |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Fill uCode API rate_n_flags field, based on "search" or "active" table. |
| 537 | */ |
| 538 | /* FIXME:RS:remove this function and put the flags statically in the table */ |
| 539 | static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm, |
| 540 | struct iwl_scale_tbl_info *tbl, |
| 541 | int index, u8 use_green) |
| 542 | { |
| 543 | u32 rate_n_flags = 0; |
| 544 | |
| 545 | if (is_legacy(tbl->lq_type)) { |
| 546 | rate_n_flags = iwl_rates[index].plcp; |
| 547 | if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) |
| 548 | rate_n_flags |= RATE_MCS_CCK_MSK; |
| 549 | } else if (is_Ht(tbl->lq_type)) { |
| 550 | if (index > IWL_LAST_OFDM_RATE) { |
| 551 | IWL_ERR(mvm, "Invalid HT rate index %d\n", index); |
| 552 | index = IWL_LAST_OFDM_RATE; |
| 553 | } |
| 554 | rate_n_flags = RATE_MCS_HT_MSK; |
| 555 | |
| 556 | if (is_siso(tbl->lq_type)) |
| 557 | rate_n_flags |= iwl_rates[index].plcp_siso; |
| 558 | else if (is_mimo2(tbl->lq_type)) |
| 559 | rate_n_flags |= iwl_rates[index].plcp_mimo2; |
| 560 | else |
| 561 | rate_n_flags |= iwl_rates[index].plcp_mimo3; |
| 562 | } else { |
| 563 | IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type); |
| 564 | } |
| 565 | |
| 566 | rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & |
| 567 | RATE_MCS_ANT_ABC_MSK); |
| 568 | |
| 569 | if (is_Ht(tbl->lq_type)) { |
| 570 | if (tbl->is_ht40) |
| 571 | rate_n_flags |= RATE_MCS_CHAN_WIDTH_40; |
| 572 | if (tbl->is_SGI) |
| 573 | rate_n_flags |= RATE_MCS_SGI_MSK; |
| 574 | |
| 575 | if (use_green) { |
| 576 | rate_n_flags |= RATE_HT_MCS_GF_MSK; |
| 577 | if (is_siso(tbl->lq_type) && tbl->is_SGI) { |
| 578 | rate_n_flags &= ~RATE_MCS_SGI_MSK; |
| 579 | IWL_ERR(mvm, "GF was set with SGI:SISO\n"); |
| 580 | } |
| 581 | } |
| 582 | } |
| 583 | return rate_n_flags; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Interpret uCode API's rate_n_flags format, |
| 588 | * fill "search" or "active" tx mode table. |
| 589 | */ |
| 590 | static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, |
| 591 | enum ieee80211_band band, |
| 592 | struct iwl_scale_tbl_info *tbl, |
| 593 | int *rate_idx) |
| 594 | { |
| 595 | u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); |
| 596 | u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); |
| 597 | u8 mcs; |
| 598 | |
| 599 | memset(tbl, 0, sizeof(struct iwl_scale_tbl_info)); |
| 600 | *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); |
| 601 | |
| 602 | if (*rate_idx == IWL_RATE_INVALID) { |
| 603 | *rate_idx = -1; |
| 604 | return -EINVAL; |
| 605 | } |
| 606 | tbl->is_SGI = 0; /* default legacy setup */ |
| 607 | tbl->is_ht40 = 0; |
| 608 | tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); |
| 609 | tbl->lq_type = LQ_NONE; |
| 610 | tbl->max_search = IWL_MAX_SEARCH; |
| 611 | |
| 612 | /* legacy rate format */ |
| 613 | if (!(rate_n_flags & RATE_MCS_HT_MSK)) { |
| 614 | if (num_of_ant == 1) { |
| 615 | if (band == IEEE80211_BAND_5GHZ) |
| 616 | tbl->lq_type = LQ_A; |
| 617 | else |
| 618 | tbl->lq_type = LQ_G; |
| 619 | } |
| 620 | /* HT rate format */ |
| 621 | } else { |
| 622 | if (rate_n_flags & RATE_MCS_SGI_MSK) |
| 623 | tbl->is_SGI = 1; |
| 624 | |
| 625 | if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */ |
| 626 | tbl->is_ht40 = 1; |
| 627 | |
| 628 | mcs = rs_extract_rate(rate_n_flags); |
| 629 | |
| 630 | /* SISO */ |
| 631 | if (mcs <= IWL_RATE_SISO_60M_PLCP) { |
| 632 | if (num_of_ant == 1) |
| 633 | tbl->lq_type = LQ_SISO; /*else NONE*/ |
| 634 | /* MIMO2 */ |
| 635 | } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { |
| 636 | if (num_of_ant == 2) |
| 637 | tbl->lq_type = LQ_MIMO2; |
| 638 | /* MIMO3 */ |
| 639 | } else { |
| 640 | if (num_of_ant == 3) { |
| 641 | tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; |
| 642 | tbl->lq_type = LQ_MIMO3; |
| 643 | } |
| 644 | } |
| 645 | } |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | /* switch to another antenna/antennas and return 1 */ |
| 650 | /* if no other valid antenna found, return 0 */ |
| 651 | static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags, |
| 652 | struct iwl_scale_tbl_info *tbl) |
| 653 | { |
| 654 | u8 new_ant_type; |
| 655 | |
| 656 | if (!tbl->ant_type || tbl->ant_type > ANT_ABC) |
| 657 | return 0; |
| 658 | |
| 659 | if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) |
| 660 | return 0; |
| 661 | |
| 662 | new_ant_type = ant_toggle_lookup[tbl->ant_type]; |
| 663 | |
| 664 | while ((new_ant_type != tbl->ant_type) && |
| 665 | !rs_is_valid_ant(valid_ant, new_ant_type)) |
| 666 | new_ant_type = ant_toggle_lookup[new_ant_type]; |
| 667 | |
| 668 | if (new_ant_type == tbl->ant_type) |
| 669 | return 0; |
| 670 | |
| 671 | tbl->ant_type = new_ant_type; |
| 672 | *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; |
| 673 | *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; |
| 674 | return 1; |
| 675 | } |
| 676 | |
| 677 | /** |
| 678 | * Green-field mode is valid if the station supports it and |
| 679 | * there are no non-GF stations present in the BSS. |
| 680 | */ |
| 681 | static bool rs_use_green(struct ieee80211_sta *sta) |
| 682 | { |
| 683 | struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv; |
| 684 | |
| 685 | bool use_green = !(sta_priv->vif->bss_conf.ht_operation_mode & |
| 686 | IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT); |
| 687 | |
| 688 | return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) && use_green; |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * rs_get_supported_rates - get the available rates |
| 693 | * |
| 694 | * if management frame or broadcast frame only return |
| 695 | * basic available rates. |
| 696 | * |
| 697 | */ |
| 698 | static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, |
| 699 | struct ieee80211_hdr *hdr, |
| 700 | enum iwl_table_type rate_type) |
| 701 | { |
| 702 | if (is_legacy(rate_type)) { |
| 703 | return lq_sta->active_legacy_rate; |
| 704 | } else { |
| 705 | if (is_siso(rate_type)) |
| 706 | return lq_sta->active_siso_rate; |
| 707 | else if (is_mimo2(rate_type)) |
| 708 | return lq_sta->active_mimo2_rate; |
| 709 | else |
| 710 | return lq_sta->active_mimo3_rate; |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, |
| 715 | int rate_type) |
| 716 | { |
| 717 | u8 high = IWL_RATE_INVALID; |
| 718 | u8 low = IWL_RATE_INVALID; |
| 719 | |
| 720 | /* 802.11A or ht walks to the next literal adjacent rate in |
| 721 | * the rate table */ |
| 722 | if (is_a_band(rate_type) || !is_legacy(rate_type)) { |
| 723 | int i; |
| 724 | u32 mask; |
| 725 | |
| 726 | /* Find the previous rate that is in the rate mask */ |
| 727 | i = index - 1; |
| 728 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { |
| 729 | if (rate_mask & mask) { |
| 730 | low = i; |
| 731 | break; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* Find the next rate that is in the rate mask */ |
| 736 | i = index + 1; |
| 737 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { |
| 738 | if (rate_mask & mask) { |
| 739 | high = i; |
| 740 | break; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | return (high << 8) | low; |
| 745 | } |
| 746 | |
| 747 | low = index; |
| 748 | while (low != IWL_RATE_INVALID) { |
| 749 | low = iwl_rates[low].prev_rs; |
| 750 | if (low == IWL_RATE_INVALID) |
| 751 | break; |
| 752 | if (rate_mask & (1 << low)) |
| 753 | break; |
| 754 | IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low); |
| 755 | } |
| 756 | |
| 757 | high = index; |
| 758 | while (high != IWL_RATE_INVALID) { |
| 759 | high = iwl_rates[high].next_rs; |
| 760 | if (high == IWL_RATE_INVALID) |
| 761 | break; |
| 762 | if (rate_mask & (1 << high)) |
| 763 | break; |
| 764 | IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high); |
| 765 | } |
| 766 | |
| 767 | return (high << 8) | low; |
| 768 | } |
| 769 | |
| 770 | static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, |
| 771 | struct iwl_scale_tbl_info *tbl, |
| 772 | u8 scale_index, u8 ht_possible) |
| 773 | { |
| 774 | s32 low; |
| 775 | u16 rate_mask; |
| 776 | u16 high_low; |
| 777 | u8 switch_to_legacy = 0; |
| 778 | u8 is_green = lq_sta->is_green; |
| 779 | struct iwl_mvm *mvm = lq_sta->drv; |
| 780 | |
| 781 | /* check if we need to switch from HT to legacy rates. |
| 782 | * assumption is that mandatory rates (1Mbps or 6Mbps) |
| 783 | * are always supported (spec demand) */ |
| 784 | if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { |
| 785 | switch_to_legacy = 1; |
| 786 | scale_index = rs_ht_to_legacy[scale_index]; |
| 787 | if (lq_sta->band == IEEE80211_BAND_5GHZ) |
| 788 | tbl->lq_type = LQ_A; |
| 789 | else |
| 790 | tbl->lq_type = LQ_G; |
| 791 | |
| 792 | if (num_of_ant(tbl->ant_type) > 1) |
| 793 | tbl->ant_type = |
| 794 | first_antenna(mvm->nvm_data->valid_tx_ant); |
| 795 | |
| 796 | tbl->is_ht40 = 0; |
| 797 | tbl->is_SGI = 0; |
| 798 | tbl->max_search = IWL_MAX_SEARCH; |
| 799 | } |
| 800 | |
| 801 | rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); |
| 802 | |
| 803 | /* Mask with station rate restriction */ |
| 804 | if (is_legacy(tbl->lq_type)) { |
| 805 | /* supp_rates has no CCK bits in A mode */ |
| 806 | if (lq_sta->band == IEEE80211_BAND_5GHZ) |
| 807 | rate_mask = (u16)(rate_mask & |
| 808 | (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); |
| 809 | else |
| 810 | rate_mask = (u16)(rate_mask & lq_sta->supp_rates); |
| 811 | } |
| 812 | |
| 813 | /* If we switched from HT to legacy, check current rate */ |
| 814 | if (switch_to_legacy && (rate_mask & (1 << scale_index))) { |
| 815 | low = scale_index; |
| 816 | goto out; |
| 817 | } |
| 818 | |
| 819 | high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, |
| 820 | tbl->lq_type); |
| 821 | low = high_low & 0xff; |
| 822 | |
| 823 | if (low == IWL_RATE_INVALID) |
| 824 | low = scale_index; |
| 825 | |
| 826 | out: |
| 827 | return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * Simple function to compare two rate scale table types |
| 832 | */ |
| 833 | static bool table_type_matches(struct iwl_scale_tbl_info *a, |
| 834 | struct iwl_scale_tbl_info *b) |
| 835 | { |
| 836 | return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) && |
| 837 | (a->is_SGI == b->is_SGI); |
| 838 | } |
| 839 | |
| 840 | /* |
| 841 | * mac80211 sends us Tx status |
| 842 | */ |
| 843 | static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband, |
| 844 | struct ieee80211_sta *sta, void *priv_sta, |
| 845 | struct sk_buff *skb) |
| 846 | { |
| 847 | int legacy_success; |
| 848 | int retries; |
| 849 | int rs_index, mac_index, i; |
| 850 | struct iwl_lq_sta *lq_sta = priv_sta; |
| 851 | struct iwl_lq_cmd *table; |
| 852 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 853 | struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; |
| 854 | struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); |
| 855 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 856 | enum mac80211_rate_control_flags mac_flags; |
| 857 | u32 tx_rate; |
| 858 | struct iwl_scale_tbl_info tbl_type; |
| 859 | struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; |
| 860 | |
| 861 | IWL_DEBUG_RATE_LIMIT(mvm, |
| 862 | "get frame ack response, update rate scale window\n"); |
| 863 | |
| 864 | /* Treat uninitialized rate scaling data same as non-existing. */ |
| 865 | if (!lq_sta) { |
| 866 | IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); |
| 867 | return; |
| 868 | } else if (!lq_sta->drv) { |
| 869 | IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); |
| 870 | return; |
| 871 | } |
| 872 | |
| 873 | if (!ieee80211_is_data(hdr->frame_control) || |
| 874 | info->flags & IEEE80211_TX_CTL_NO_ACK) |
| 875 | return; |
| 876 | |
| 877 | /* This packet was aggregated but doesn't carry status info */ |
| 878 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && |
| 879 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) |
| 880 | return; |
| 881 | |
| 882 | /* |
| 883 | * Ignore this Tx frame response if its initial rate doesn't match |
| 884 | * that of latest Link Quality command. There may be stragglers |
| 885 | * from a previous Link Quality command, but we're no longer interested |
| 886 | * in those; they're either from the "active" mode while we're trying |
| 887 | * to check "search" mode, or a prior "search" mode after we've moved |
| 888 | * to a new "search" mode (which might become the new "active" mode). |
| 889 | */ |
| 890 | table = &lq_sta->lq; |
| 891 | tx_rate = le32_to_cpu(table->rs_table[0]); |
| 892 | rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index); |
| 893 | if (info->band == IEEE80211_BAND_5GHZ) |
| 894 | rs_index -= IWL_FIRST_OFDM_RATE; |
| 895 | mac_flags = info->status.rates[0].flags; |
| 896 | mac_index = info->status.rates[0].idx; |
| 897 | /* For HT packets, map MCS to PLCP */ |
| 898 | if (mac_flags & IEEE80211_TX_RC_MCS) { |
| 899 | /* Remove # of streams */ |
| 900 | mac_index &= RATE_HT_MCS_RATE_CODE_MSK; |
| 901 | if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE)) |
| 902 | mac_index++; |
| 903 | /* |
| 904 | * mac80211 HT index is always zero-indexed; we need to move |
| 905 | * HT OFDM rates after CCK rates in 2.4 GHz band |
| 906 | */ |
| 907 | if (info->band == IEEE80211_BAND_2GHZ) |
| 908 | mac_index += IWL_FIRST_OFDM_RATE; |
| 909 | } |
| 910 | /* Here we actually compare this rate to the latest LQ command */ |
| 911 | if ((mac_index < 0) || |
| 912 | (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) || |
| 913 | (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || |
| 914 | (tbl_type.ant_type != info->status.antenna) || |
| 915 | (!!(tx_rate & RATE_MCS_HT_MSK) != |
| 916 | !!(mac_flags & IEEE80211_TX_RC_MCS)) || |
| 917 | (!!(tx_rate & RATE_HT_MCS_GF_MSK) != |
| 918 | !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) || |
| 919 | (rs_index != mac_index)) { |
| 920 | IWL_DEBUG_RATE(mvm, |
| 921 | "initial rate %d does not match %d (0x%x)\n", |
| 922 | mac_index, rs_index, tx_rate); |
| 923 | /* |
| 924 | * Since rates mis-match, the last LQ command may have failed. |
| 925 | * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with |
| 926 | * ... driver. |
| 927 | */ |
| 928 | lq_sta->missed_rate_counter++; |
| 929 | if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { |
| 930 | lq_sta->missed_rate_counter = 0; |
| 931 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); |
| 932 | } |
| 933 | /* Regardless, ignore this status info for outdated rate */ |
| 934 | return; |
| 935 | } else |
| 936 | /* Rate did match, so reset the missed_rate_counter */ |
| 937 | lq_sta->missed_rate_counter = 0; |
| 938 | |
| 939 | /* Figure out if rate scale algorithm is in active or search table */ |
| 940 | if (table_type_matches(&tbl_type, |
| 941 | &(lq_sta->lq_info[lq_sta->active_tbl]))) { |
| 942 | curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 943 | other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); |
| 944 | } else if (table_type_matches( |
| 945 | &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) { |
| 946 | curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); |
| 947 | other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 948 | } else { |
| 949 | IWL_DEBUG_RATE(mvm, |
| 950 | "Neither active nor search matches tx rate\n"); |
| 951 | tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 952 | IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n", |
| 953 | tmp_tbl->lq_type, tmp_tbl->ant_type, |
| 954 | tmp_tbl->is_SGI); |
| 955 | tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); |
| 956 | IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n", |
| 957 | tmp_tbl->lq_type, tmp_tbl->ant_type, |
| 958 | tmp_tbl->is_SGI); |
| 959 | IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n", |
| 960 | tbl_type.lq_type, tbl_type.ant_type, |
| 961 | tbl_type.is_SGI); |
| 962 | /* |
| 963 | * no matching table found, let's by-pass the data collection |
| 964 | * and continue to perform rate scale to find the rate table |
| 965 | */ |
| 966 | rs_stay_in_table(lq_sta, true); |
| 967 | goto done; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * Updating the frame history depends on whether packets were |
| 972 | * aggregated. |
| 973 | * |
| 974 | * For aggregation, all packets were transmitted at the same rate, the |
| 975 | * first index into rate scale table. |
| 976 | */ |
| 977 | if (info->flags & IEEE80211_TX_STAT_AMPDU) { |
| 978 | tx_rate = le32_to_cpu(table->rs_table[0]); |
| 979 | rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, |
| 980 | &rs_index); |
| 981 | rs_collect_tx_data(curr_tbl, rs_index, |
| 982 | info->status.ampdu_len, |
| 983 | info->status.ampdu_ack_len); |
| 984 | |
| 985 | /* Update success/fail counts if not searching for new mode */ |
| 986 | if (lq_sta->stay_in_tbl) { |
| 987 | lq_sta->total_success += info->status.ampdu_ack_len; |
| 988 | lq_sta->total_failed += (info->status.ampdu_len - |
| 989 | info->status.ampdu_ack_len); |
| 990 | } |
| 991 | } else { |
| 992 | /* |
| 993 | * For legacy, update frame history with for each Tx retry. |
| 994 | */ |
| 995 | retries = info->status.rates[0].count - 1; |
| 996 | /* HW doesn't send more than 15 retries */ |
| 997 | retries = min(retries, 15); |
| 998 | |
| 999 | /* The last transmission may have been successful */ |
| 1000 | legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); |
| 1001 | /* Collect data for each rate used during failed TX attempts */ |
| 1002 | for (i = 0; i <= retries; ++i) { |
| 1003 | tx_rate = le32_to_cpu(table->rs_table[i]); |
| 1004 | rs_get_tbl_info_from_mcs(tx_rate, info->band, |
| 1005 | &tbl_type, &rs_index); |
| 1006 | /* |
| 1007 | * Only collect stats if retried rate is in the same RS |
| 1008 | * table as active/search. |
| 1009 | */ |
| 1010 | if (table_type_matches(&tbl_type, curr_tbl)) |
| 1011 | tmp_tbl = curr_tbl; |
| 1012 | else if (table_type_matches(&tbl_type, other_tbl)) |
| 1013 | tmp_tbl = other_tbl; |
| 1014 | else |
| 1015 | continue; |
| 1016 | rs_collect_tx_data(tmp_tbl, rs_index, 1, |
| 1017 | i < retries ? 0 : legacy_success); |
| 1018 | } |
| 1019 | |
| 1020 | /* Update success/fail counts if not searching for new mode */ |
| 1021 | if (lq_sta->stay_in_tbl) { |
| 1022 | lq_sta->total_success += legacy_success; |
| 1023 | lq_sta->total_failed += retries + (1 - legacy_success); |
| 1024 | } |
| 1025 | } |
| 1026 | /* The last TX rate is cached in lq_sta; it's set in if/else above */ |
| 1027 | lq_sta->last_rate_n_flags = tx_rate; |
| 1028 | done: |
| 1029 | /* See if there's a better rate or modulation mode to try. */ |
| 1030 | if (sta && sta->supp_rates[sband->band]) |
| 1031 | rs_rate_scale_perform(mvm, skb, sta, lq_sta); |
| 1032 | } |
| 1033 | |
| 1034 | /* |
| 1035 | * Begin a period of staying with a selected modulation mode. |
| 1036 | * Set "stay_in_tbl" flag to prevent any mode switches. |
| 1037 | * Set frame tx success limits according to legacy vs. high-throughput, |
| 1038 | * and reset overall (spanning all rates) tx success history statistics. |
| 1039 | * These control how long we stay using same modulation mode before |
| 1040 | * searching for a new mode. |
| 1041 | */ |
| 1042 | static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, |
| 1043 | struct iwl_lq_sta *lq_sta) |
| 1044 | { |
| 1045 | IWL_DEBUG_RATE(mvm, "we are staying in the same table\n"); |
| 1046 | lq_sta->stay_in_tbl = 1; /* only place this gets set */ |
| 1047 | if (is_legacy) { |
| 1048 | lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; |
| 1049 | lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; |
| 1050 | lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; |
| 1051 | } else { |
| 1052 | lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; |
| 1053 | lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; |
| 1054 | lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; |
| 1055 | } |
| 1056 | lq_sta->table_count = 0; |
| 1057 | lq_sta->total_failed = 0; |
| 1058 | lq_sta->total_success = 0; |
| 1059 | lq_sta->flush_timer = jiffies; |
| 1060 | lq_sta->action_counter = 0; |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * Find correct throughput table for given mode of modulation |
| 1065 | */ |
| 1066 | static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, |
| 1067 | struct iwl_scale_tbl_info *tbl) |
| 1068 | { |
| 1069 | /* Used to choose among HT tables */ |
| 1070 | s32 (*ht_tbl_pointer)[IWL_RATE_COUNT]; |
| 1071 | |
| 1072 | /* Check for invalid LQ type */ |
| 1073 | if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) { |
| 1074 | tbl->expected_tpt = expected_tpt_legacy; |
| 1075 | return; |
| 1076 | } |
| 1077 | |
| 1078 | /* Legacy rates have only one table */ |
| 1079 | if (is_legacy(tbl->lq_type)) { |
| 1080 | tbl->expected_tpt = expected_tpt_legacy; |
| 1081 | return; |
| 1082 | } |
| 1083 | |
| 1084 | /* Choose among many HT tables depending on number of streams |
| 1085 | * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation |
| 1086 | * status */ |
| 1087 | if (is_siso(tbl->lq_type) && !tbl->is_ht40) |
| 1088 | ht_tbl_pointer = expected_tpt_siso20MHz; |
| 1089 | else if (is_siso(tbl->lq_type)) |
| 1090 | ht_tbl_pointer = expected_tpt_siso40MHz; |
| 1091 | else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40) |
| 1092 | ht_tbl_pointer = expected_tpt_mimo2_20MHz; |
| 1093 | else if (is_mimo2(tbl->lq_type)) |
| 1094 | ht_tbl_pointer = expected_tpt_mimo2_40MHz; |
| 1095 | else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40) |
| 1096 | ht_tbl_pointer = expected_tpt_mimo3_20MHz; |
| 1097 | else /* if (is_mimo3(tbl->lq_type)) <-- must be true */ |
| 1098 | ht_tbl_pointer = expected_tpt_mimo3_40MHz; |
| 1099 | |
| 1100 | if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */ |
| 1101 | tbl->expected_tpt = ht_tbl_pointer[0]; |
| 1102 | else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */ |
| 1103 | tbl->expected_tpt = ht_tbl_pointer[1]; |
| 1104 | else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */ |
| 1105 | tbl->expected_tpt = ht_tbl_pointer[2]; |
| 1106 | else /* AGG+SGI */ |
| 1107 | tbl->expected_tpt = ht_tbl_pointer[3]; |
| 1108 | } |
| 1109 | |
| 1110 | /* |
| 1111 | * Find starting rate for new "search" high-throughput mode of modulation. |
| 1112 | * Goal is to find lowest expected rate (under perfect conditions) that is |
| 1113 | * above the current measured throughput of "active" mode, to give new mode |
| 1114 | * a fair chance to prove itself without too many challenges. |
| 1115 | * |
| 1116 | * This gets called when transitioning to more aggressive modulation |
| 1117 | * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive |
| 1118 | * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need |
| 1119 | * to decrease to match "active" throughput. When moving from MIMO to SISO, |
| 1120 | * bit rate will typically need to increase, but not if performance was bad. |
| 1121 | */ |
| 1122 | static s32 rs_get_best_rate(struct iwl_mvm *mvm, |
| 1123 | struct iwl_lq_sta *lq_sta, |
| 1124 | struct iwl_scale_tbl_info *tbl, /* "search" */ |
| 1125 | u16 rate_mask, s8 index) |
| 1126 | { |
| 1127 | /* "active" values */ |
| 1128 | struct iwl_scale_tbl_info *active_tbl = |
| 1129 | &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 1130 | s32 active_sr = active_tbl->win[index].success_ratio; |
| 1131 | s32 active_tpt = active_tbl->expected_tpt[index]; |
| 1132 | |
| 1133 | /* expected "search" throughput */ |
| 1134 | s32 *tpt_tbl = tbl->expected_tpt; |
| 1135 | |
| 1136 | s32 new_rate, high, low, start_hi; |
| 1137 | u16 high_low; |
| 1138 | s8 rate = index; |
| 1139 | |
| 1140 | new_rate = high = low = start_hi = IWL_RATE_INVALID; |
| 1141 | |
| 1142 | while (1) { |
| 1143 | high_low = rs_get_adjacent_rate(mvm, rate, rate_mask, |
| 1144 | tbl->lq_type); |
| 1145 | |
| 1146 | low = high_low & 0xff; |
| 1147 | high = (high_low >> 8) & 0xff; |
| 1148 | |
| 1149 | /* |
| 1150 | * Lower the "search" bit rate, to give new "search" mode |
| 1151 | * approximately the same throughput as "active" if: |
| 1152 | * |
| 1153 | * 1) "Active" mode has been working modestly well (but not |
| 1154 | * great), and expected "search" throughput (under perfect |
| 1155 | * conditions) at candidate rate is above the actual |
| 1156 | * measured "active" throughput (but less than expected |
| 1157 | * "active" throughput under perfect conditions). |
| 1158 | * OR |
| 1159 | * 2) "Active" mode has been working perfectly or very well |
| 1160 | * and expected "search" throughput (under perfect |
| 1161 | * conditions) at candidate rate is above expected |
| 1162 | * "active" throughput (under perfect conditions). |
| 1163 | */ |
| 1164 | if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && |
| 1165 | ((active_sr > IWL_RATE_DECREASE_TH) && |
| 1166 | (active_sr <= IWL_RATE_HIGH_TH) && |
| 1167 | (tpt_tbl[rate] <= active_tpt))) || |
| 1168 | ((active_sr >= IWL_RATE_SCALE_SWITCH) && |
| 1169 | (tpt_tbl[rate] > active_tpt))) { |
| 1170 | /* (2nd or later pass) |
| 1171 | * If we've already tried to raise the rate, and are |
| 1172 | * now trying to lower it, use the higher rate. */ |
| 1173 | if (start_hi != IWL_RATE_INVALID) { |
| 1174 | new_rate = start_hi; |
| 1175 | break; |
| 1176 | } |
| 1177 | |
| 1178 | new_rate = rate; |
| 1179 | |
| 1180 | /* Loop again with lower rate */ |
| 1181 | if (low != IWL_RATE_INVALID) |
| 1182 | rate = low; |
| 1183 | |
| 1184 | /* Lower rate not available, use the original */ |
| 1185 | else |
| 1186 | break; |
| 1187 | |
| 1188 | /* Else try to raise the "search" rate to match "active" */ |
| 1189 | } else { |
| 1190 | /* (2nd or later pass) |
| 1191 | * If we've already tried to lower the rate, and are |
| 1192 | * now trying to raise it, use the lower rate. */ |
| 1193 | if (new_rate != IWL_RATE_INVALID) |
| 1194 | break; |
| 1195 | |
| 1196 | /* Loop again with higher rate */ |
| 1197 | else if (high != IWL_RATE_INVALID) { |
| 1198 | start_hi = high; |
| 1199 | rate = high; |
| 1200 | |
| 1201 | /* Higher rate not available, use the original */ |
| 1202 | } else { |
| 1203 | new_rate = rate; |
| 1204 | break; |
| 1205 | } |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | return new_rate; |
| 1210 | } |
| 1211 | |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1212 | static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1213 | { |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1214 | return sta->bandwidth >= IEEE80211_STA_RX_BW_40; |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Set up search table for MIMO2 |
| 1219 | */ |
| 1220 | static int rs_switch_to_mimo2(struct iwl_mvm *mvm, |
| 1221 | struct iwl_lq_sta *lq_sta, |
| 1222 | struct ieee80211_sta *sta, |
| 1223 | struct iwl_scale_tbl_info *tbl, int index) |
| 1224 | { |
| 1225 | u16 rate_mask; |
| 1226 | s32 rate; |
| 1227 | s8 is_green = lq_sta->is_green; |
| 1228 | |
| 1229 | if (!sta->ht_cap.ht_supported) |
| 1230 | return -1; |
| 1231 | |
Johannes Berg | af0ed69 | 2013-02-12 14:21:00 +0100 | [diff] [blame^] | 1232 | if (sta->smps_mode == IEEE80211_SMPS_STATIC) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1233 | return -1; |
| 1234 | |
| 1235 | /* Need both Tx chains/antennas to support MIMO */ |
| 1236 | if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 2) |
| 1237 | return -1; |
| 1238 | |
| 1239 | IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n"); |
| 1240 | |
| 1241 | tbl->lq_type = LQ_MIMO2; |
| 1242 | tbl->action = 0; |
| 1243 | tbl->max_search = IWL_MAX_SEARCH; |
| 1244 | rate_mask = lq_sta->active_mimo2_rate; |
| 1245 | |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1246 | if (iwl_is_ht40_tx_allowed(sta)) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1247 | tbl->is_ht40 = 1; |
| 1248 | else |
| 1249 | tbl->is_ht40 = 0; |
| 1250 | |
| 1251 | rs_set_expected_tpt_table(lq_sta, tbl); |
| 1252 | |
| 1253 | rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index); |
| 1254 | |
| 1255 | IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n", |
| 1256 | rate, rate_mask); |
| 1257 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { |
| 1258 | IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n", |
| 1259 | rate, rate_mask); |
| 1260 | return -1; |
| 1261 | } |
| 1262 | tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); |
| 1263 | |
| 1264 | IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n", |
| 1265 | tbl->current_rate, is_green); |
| 1266 | return 0; |
| 1267 | } |
| 1268 | |
| 1269 | /* |
| 1270 | * Set up search table for MIMO3 |
| 1271 | */ |
| 1272 | static int rs_switch_to_mimo3(struct iwl_mvm *mvm, |
| 1273 | struct iwl_lq_sta *lq_sta, |
| 1274 | struct ieee80211_sta *sta, |
| 1275 | struct iwl_scale_tbl_info *tbl, int index) |
| 1276 | { |
| 1277 | u16 rate_mask; |
| 1278 | s32 rate; |
| 1279 | s8 is_green = lq_sta->is_green; |
| 1280 | |
| 1281 | if (!sta->ht_cap.ht_supported) |
| 1282 | return -1; |
| 1283 | |
Johannes Berg | af0ed69 | 2013-02-12 14:21:00 +0100 | [diff] [blame^] | 1284 | if (sta->smps_mode == IEEE80211_SMPS_STATIC) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1285 | return -1; |
| 1286 | |
| 1287 | /* Need both Tx chains/antennas to support MIMO */ |
| 1288 | if (num_of_ant(mvm->nvm_data->valid_tx_ant) < 3) |
| 1289 | return -1; |
| 1290 | |
| 1291 | IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n"); |
| 1292 | |
| 1293 | tbl->lq_type = LQ_MIMO3; |
| 1294 | tbl->action = 0; |
| 1295 | tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH; |
| 1296 | rate_mask = lq_sta->active_mimo3_rate; |
| 1297 | |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1298 | if (iwl_is_ht40_tx_allowed(sta)) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1299 | tbl->is_ht40 = 1; |
| 1300 | else |
| 1301 | tbl->is_ht40 = 0; |
| 1302 | |
| 1303 | rs_set_expected_tpt_table(lq_sta, tbl); |
| 1304 | |
| 1305 | rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index); |
| 1306 | |
| 1307 | IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n", |
| 1308 | rate, rate_mask); |
| 1309 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { |
| 1310 | IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n", |
| 1311 | rate, rate_mask); |
| 1312 | return -1; |
| 1313 | } |
| 1314 | tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); |
| 1315 | |
| 1316 | IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n", |
| 1317 | tbl->current_rate, is_green); |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * Set up search table for SISO |
| 1323 | */ |
| 1324 | static int rs_switch_to_siso(struct iwl_mvm *mvm, |
| 1325 | struct iwl_lq_sta *lq_sta, |
| 1326 | struct ieee80211_sta *sta, |
| 1327 | struct iwl_scale_tbl_info *tbl, int index) |
| 1328 | { |
| 1329 | u16 rate_mask; |
| 1330 | u8 is_green = lq_sta->is_green; |
| 1331 | s32 rate; |
| 1332 | |
| 1333 | if (!sta->ht_cap.ht_supported) |
| 1334 | return -1; |
| 1335 | |
| 1336 | IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n"); |
| 1337 | |
| 1338 | tbl->lq_type = LQ_SISO; |
| 1339 | tbl->action = 0; |
| 1340 | tbl->max_search = IWL_MAX_SEARCH; |
| 1341 | rate_mask = lq_sta->active_siso_rate; |
| 1342 | |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1343 | if (iwl_is_ht40_tx_allowed(sta)) |
Johannes Berg | 8ca151b | 2013-01-24 14:25:36 +0100 | [diff] [blame] | 1344 | tbl->is_ht40 = 1; |
| 1345 | else |
| 1346 | tbl->is_ht40 = 0; |
| 1347 | |
| 1348 | if (is_green) |
| 1349 | tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ |
| 1350 | |
| 1351 | rs_set_expected_tpt_table(lq_sta, tbl); |
| 1352 | rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index); |
| 1353 | |
| 1354 | IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask); |
| 1355 | if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { |
| 1356 | IWL_DEBUG_RATE(mvm, |
| 1357 | "can not switch with index %d rate mask %x\n", |
| 1358 | rate, rate_mask); |
| 1359 | return -1; |
| 1360 | } |
| 1361 | tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green); |
| 1362 | IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n", |
| 1363 | tbl->current_rate, is_green); |
| 1364 | return 0; |
| 1365 | } |
| 1366 | |
| 1367 | /* |
| 1368 | * Try to switch to new modulation mode from legacy |
| 1369 | */ |
| 1370 | static int rs_move_legacy_other(struct iwl_mvm *mvm, |
| 1371 | struct iwl_lq_sta *lq_sta, |
| 1372 | struct ieee80211_sta *sta, |
| 1373 | int index) |
| 1374 | { |
| 1375 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 1376 | struct iwl_scale_tbl_info *search_tbl = |
| 1377 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| 1378 | struct iwl_rate_scale_data *window = &(tbl->win[index]); |
| 1379 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - |
| 1380 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); |
| 1381 | u8 start_action; |
| 1382 | u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 1383 | u8 tx_chains_num = num_of_ant(valid_tx_ant); |
| 1384 | int ret; |
| 1385 | u8 update_search_tbl_counter = 0; |
| 1386 | |
| 1387 | start_action = tbl->action; |
| 1388 | while (1) { |
| 1389 | lq_sta->action_counter++; |
| 1390 | switch (tbl->action) { |
| 1391 | case IWL_LEGACY_SWITCH_ANTENNA1: |
| 1392 | case IWL_LEGACY_SWITCH_ANTENNA2: |
| 1393 | IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n"); |
| 1394 | |
| 1395 | if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && |
| 1396 | tx_chains_num <= 1) || |
| 1397 | (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && |
| 1398 | tx_chains_num <= 2)) |
| 1399 | break; |
| 1400 | |
| 1401 | /* Don't change antenna if success has been great */ |
| 1402 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) |
| 1403 | break; |
| 1404 | |
| 1405 | /* Set up search table to try other antenna */ |
| 1406 | memcpy(search_tbl, tbl, sz); |
| 1407 | |
| 1408 | if (rs_toggle_antenna(valid_tx_ant, |
| 1409 | &search_tbl->current_rate, |
| 1410 | search_tbl)) { |
| 1411 | update_search_tbl_counter = 1; |
| 1412 | rs_set_expected_tpt_table(lq_sta, search_tbl); |
| 1413 | goto out; |
| 1414 | } |
| 1415 | break; |
| 1416 | case IWL_LEGACY_SWITCH_SISO: |
| 1417 | IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n"); |
| 1418 | |
| 1419 | /* Set up search table to try SISO */ |
| 1420 | memcpy(search_tbl, tbl, sz); |
| 1421 | search_tbl->is_SGI = 0; |
| 1422 | ret = rs_switch_to_siso(mvm, lq_sta, sta, |
| 1423 | search_tbl, index); |
| 1424 | if (!ret) { |
| 1425 | lq_sta->action_counter = 0; |
| 1426 | goto out; |
| 1427 | } |
| 1428 | |
| 1429 | break; |
| 1430 | case IWL_LEGACY_SWITCH_MIMO2_AB: |
| 1431 | case IWL_LEGACY_SWITCH_MIMO2_AC: |
| 1432 | case IWL_LEGACY_SWITCH_MIMO2_BC: |
| 1433 | IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n"); |
| 1434 | |
| 1435 | /* Set up search table to try MIMO */ |
| 1436 | memcpy(search_tbl, tbl, sz); |
| 1437 | search_tbl->is_SGI = 0; |
| 1438 | |
| 1439 | if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) |
| 1440 | search_tbl->ant_type = ANT_AB; |
| 1441 | else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) |
| 1442 | search_tbl->ant_type = ANT_AC; |
| 1443 | else |
| 1444 | search_tbl->ant_type = ANT_BC; |
| 1445 | |
| 1446 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1447 | search_tbl->ant_type)) |
| 1448 | break; |
| 1449 | |
| 1450 | ret = rs_switch_to_mimo2(mvm, lq_sta, sta, |
| 1451 | search_tbl, index); |
| 1452 | if (!ret) { |
| 1453 | lq_sta->action_counter = 0; |
| 1454 | goto out; |
| 1455 | } |
| 1456 | break; |
| 1457 | |
| 1458 | case IWL_LEGACY_SWITCH_MIMO3_ABC: |
| 1459 | IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n"); |
| 1460 | |
| 1461 | /* Set up search table to try MIMO3 */ |
| 1462 | memcpy(search_tbl, tbl, sz); |
| 1463 | search_tbl->is_SGI = 0; |
| 1464 | |
| 1465 | search_tbl->ant_type = ANT_ABC; |
| 1466 | |
| 1467 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1468 | search_tbl->ant_type)) |
| 1469 | break; |
| 1470 | |
| 1471 | ret = rs_switch_to_mimo3(mvm, lq_sta, sta, |
| 1472 | search_tbl, index); |
| 1473 | if (!ret) { |
| 1474 | lq_sta->action_counter = 0; |
| 1475 | goto out; |
| 1476 | } |
| 1477 | break; |
| 1478 | } |
| 1479 | tbl->action++; |
| 1480 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) |
| 1481 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; |
| 1482 | |
| 1483 | if (tbl->action == start_action) |
| 1484 | break; |
| 1485 | } |
| 1486 | search_tbl->lq_type = LQ_NONE; |
| 1487 | return 0; |
| 1488 | |
| 1489 | out: |
| 1490 | lq_sta->search_better_tbl = 1; |
| 1491 | tbl->action++; |
| 1492 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) |
| 1493 | tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; |
| 1494 | if (update_search_tbl_counter) |
| 1495 | search_tbl->action = tbl->action; |
| 1496 | return 0; |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | * Try to switch to new modulation mode from SISO |
| 1501 | */ |
| 1502 | static int rs_move_siso_to_other(struct iwl_mvm *mvm, |
| 1503 | struct iwl_lq_sta *lq_sta, |
| 1504 | struct ieee80211_sta *sta, int index) |
| 1505 | { |
| 1506 | u8 is_green = lq_sta->is_green; |
| 1507 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 1508 | struct iwl_scale_tbl_info *search_tbl = |
| 1509 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| 1510 | struct iwl_rate_scale_data *window = &(tbl->win[index]); |
| 1511 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; |
| 1512 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - |
| 1513 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); |
| 1514 | u8 start_action; |
| 1515 | u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 1516 | u8 tx_chains_num = num_of_ant(valid_tx_ant); |
| 1517 | u8 update_search_tbl_counter = 0; |
| 1518 | int ret; |
| 1519 | |
| 1520 | start_action = tbl->action; |
| 1521 | while (1) { |
| 1522 | lq_sta->action_counter++; |
| 1523 | switch (tbl->action) { |
| 1524 | case IWL_SISO_SWITCH_ANTENNA1: |
| 1525 | case IWL_SISO_SWITCH_ANTENNA2: |
| 1526 | IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n"); |
| 1527 | if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && |
| 1528 | tx_chains_num <= 1) || |
| 1529 | (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && |
| 1530 | tx_chains_num <= 2)) |
| 1531 | break; |
| 1532 | |
| 1533 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) |
| 1534 | break; |
| 1535 | |
| 1536 | memcpy(search_tbl, tbl, sz); |
| 1537 | if (rs_toggle_antenna(valid_tx_ant, |
| 1538 | &search_tbl->current_rate, |
| 1539 | search_tbl)) { |
| 1540 | update_search_tbl_counter = 1; |
| 1541 | goto out; |
| 1542 | } |
| 1543 | break; |
| 1544 | case IWL_SISO_SWITCH_MIMO2_AB: |
| 1545 | case IWL_SISO_SWITCH_MIMO2_AC: |
| 1546 | case IWL_SISO_SWITCH_MIMO2_BC: |
| 1547 | IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n"); |
| 1548 | memcpy(search_tbl, tbl, sz); |
| 1549 | search_tbl->is_SGI = 0; |
| 1550 | |
| 1551 | if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) |
| 1552 | search_tbl->ant_type = ANT_AB; |
| 1553 | else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) |
| 1554 | search_tbl->ant_type = ANT_AC; |
| 1555 | else |
| 1556 | search_tbl->ant_type = ANT_BC; |
| 1557 | |
| 1558 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1559 | search_tbl->ant_type)) |
| 1560 | break; |
| 1561 | |
| 1562 | ret = rs_switch_to_mimo2(mvm, lq_sta, sta, |
| 1563 | search_tbl, index); |
| 1564 | if (!ret) |
| 1565 | goto out; |
| 1566 | break; |
| 1567 | case IWL_SISO_SWITCH_GI: |
| 1568 | if (!tbl->is_ht40 && !(ht_cap->cap & |
| 1569 | IEEE80211_HT_CAP_SGI_20)) |
| 1570 | break; |
| 1571 | if (tbl->is_ht40 && !(ht_cap->cap & |
| 1572 | IEEE80211_HT_CAP_SGI_40)) |
| 1573 | break; |
| 1574 | |
| 1575 | IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n"); |
| 1576 | |
| 1577 | memcpy(search_tbl, tbl, sz); |
| 1578 | if (is_green) { |
| 1579 | if (!tbl->is_SGI) |
| 1580 | break; |
| 1581 | else |
| 1582 | IWL_ERR(mvm, |
| 1583 | "SGI was set in GF+SISO\n"); |
| 1584 | } |
| 1585 | search_tbl->is_SGI = !tbl->is_SGI; |
| 1586 | rs_set_expected_tpt_table(lq_sta, search_tbl); |
| 1587 | if (tbl->is_SGI) { |
| 1588 | s32 tpt = lq_sta->last_tpt / 100; |
| 1589 | if (tpt >= search_tbl->expected_tpt[index]) |
| 1590 | break; |
| 1591 | } |
| 1592 | search_tbl->current_rate = |
| 1593 | rate_n_flags_from_tbl(mvm, search_tbl, |
| 1594 | index, is_green); |
| 1595 | update_search_tbl_counter = 1; |
| 1596 | goto out; |
| 1597 | case IWL_SISO_SWITCH_MIMO3_ABC: |
| 1598 | IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n"); |
| 1599 | memcpy(search_tbl, tbl, sz); |
| 1600 | search_tbl->is_SGI = 0; |
| 1601 | search_tbl->ant_type = ANT_ABC; |
| 1602 | |
| 1603 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1604 | search_tbl->ant_type)) |
| 1605 | break; |
| 1606 | |
| 1607 | ret = rs_switch_to_mimo3(mvm, lq_sta, sta, |
| 1608 | search_tbl, index); |
| 1609 | if (!ret) |
| 1610 | goto out; |
| 1611 | break; |
| 1612 | } |
| 1613 | tbl->action++; |
| 1614 | if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC) |
| 1615 | tbl->action = IWL_SISO_SWITCH_ANTENNA1; |
| 1616 | |
| 1617 | if (tbl->action == start_action) |
| 1618 | break; |
| 1619 | } |
| 1620 | search_tbl->lq_type = LQ_NONE; |
| 1621 | return 0; |
| 1622 | |
| 1623 | out: |
| 1624 | lq_sta->search_better_tbl = 1; |
| 1625 | tbl->action++; |
| 1626 | if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC) |
| 1627 | tbl->action = IWL_SISO_SWITCH_ANTENNA1; |
| 1628 | if (update_search_tbl_counter) |
| 1629 | search_tbl->action = tbl->action; |
| 1630 | |
| 1631 | return 0; |
| 1632 | } |
| 1633 | |
| 1634 | /* |
| 1635 | * Try to switch to new modulation mode from MIMO2 |
| 1636 | */ |
| 1637 | static int rs_move_mimo2_to_other(struct iwl_mvm *mvm, |
| 1638 | struct iwl_lq_sta *lq_sta, |
| 1639 | struct ieee80211_sta *sta, int index) |
| 1640 | { |
| 1641 | s8 is_green = lq_sta->is_green; |
| 1642 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 1643 | struct iwl_scale_tbl_info *search_tbl = |
| 1644 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| 1645 | struct iwl_rate_scale_data *window = &(tbl->win[index]); |
| 1646 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; |
| 1647 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - |
| 1648 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); |
| 1649 | u8 start_action; |
| 1650 | u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 1651 | u8 tx_chains_num = num_of_ant(valid_tx_ant); |
| 1652 | u8 update_search_tbl_counter = 0; |
| 1653 | int ret; |
| 1654 | |
| 1655 | start_action = tbl->action; |
| 1656 | while (1) { |
| 1657 | lq_sta->action_counter++; |
| 1658 | switch (tbl->action) { |
| 1659 | case IWL_MIMO2_SWITCH_ANTENNA1: |
| 1660 | case IWL_MIMO2_SWITCH_ANTENNA2: |
| 1661 | IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n"); |
| 1662 | |
| 1663 | if (tx_chains_num <= 2) |
| 1664 | break; |
| 1665 | |
| 1666 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) |
| 1667 | break; |
| 1668 | |
| 1669 | memcpy(search_tbl, tbl, sz); |
| 1670 | if (rs_toggle_antenna(valid_tx_ant, |
| 1671 | &search_tbl->current_rate, |
| 1672 | search_tbl)) { |
| 1673 | update_search_tbl_counter = 1; |
| 1674 | goto out; |
| 1675 | } |
| 1676 | break; |
| 1677 | case IWL_MIMO2_SWITCH_SISO_A: |
| 1678 | case IWL_MIMO2_SWITCH_SISO_B: |
| 1679 | case IWL_MIMO2_SWITCH_SISO_C: |
| 1680 | IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n"); |
| 1681 | |
| 1682 | /* Set up new search table for SISO */ |
| 1683 | memcpy(search_tbl, tbl, sz); |
| 1684 | |
| 1685 | if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) |
| 1686 | search_tbl->ant_type = ANT_A; |
| 1687 | else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) |
| 1688 | search_tbl->ant_type = ANT_B; |
| 1689 | else |
| 1690 | search_tbl->ant_type = ANT_C; |
| 1691 | |
| 1692 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1693 | search_tbl->ant_type)) |
| 1694 | break; |
| 1695 | |
| 1696 | ret = rs_switch_to_siso(mvm, lq_sta, sta, |
| 1697 | search_tbl, index); |
| 1698 | if (!ret) |
| 1699 | goto out; |
| 1700 | |
| 1701 | break; |
| 1702 | |
| 1703 | case IWL_MIMO2_SWITCH_GI: |
| 1704 | if (!tbl->is_ht40 && !(ht_cap->cap & |
| 1705 | IEEE80211_HT_CAP_SGI_20)) |
| 1706 | break; |
| 1707 | if (tbl->is_ht40 && !(ht_cap->cap & |
| 1708 | IEEE80211_HT_CAP_SGI_40)) |
| 1709 | break; |
| 1710 | |
| 1711 | IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n"); |
| 1712 | |
| 1713 | /* Set up new search table for MIMO2 */ |
| 1714 | memcpy(search_tbl, tbl, sz); |
| 1715 | search_tbl->is_SGI = !tbl->is_SGI; |
| 1716 | rs_set_expected_tpt_table(lq_sta, search_tbl); |
| 1717 | /* |
| 1718 | * If active table already uses the fastest possible |
| 1719 | * modulation (dual stream with short guard interval), |
| 1720 | * and it's working well, there's no need to look |
| 1721 | * for a better type of modulation! |
| 1722 | */ |
| 1723 | if (tbl->is_SGI) { |
| 1724 | s32 tpt = lq_sta->last_tpt / 100; |
| 1725 | if (tpt >= search_tbl->expected_tpt[index]) |
| 1726 | break; |
| 1727 | } |
| 1728 | search_tbl->current_rate = |
| 1729 | rate_n_flags_from_tbl(mvm, search_tbl, |
| 1730 | index, is_green); |
| 1731 | update_search_tbl_counter = 1; |
| 1732 | goto out; |
| 1733 | |
| 1734 | case IWL_MIMO2_SWITCH_MIMO3_ABC: |
| 1735 | IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n"); |
| 1736 | memcpy(search_tbl, tbl, sz); |
| 1737 | search_tbl->is_SGI = 0; |
| 1738 | search_tbl->ant_type = ANT_ABC; |
| 1739 | |
| 1740 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1741 | search_tbl->ant_type)) |
| 1742 | break; |
| 1743 | |
| 1744 | ret = rs_switch_to_mimo3(mvm, lq_sta, sta, |
| 1745 | search_tbl, index); |
| 1746 | if (!ret) |
| 1747 | goto out; |
| 1748 | |
| 1749 | break; |
| 1750 | } |
| 1751 | tbl->action++; |
| 1752 | if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) |
| 1753 | tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; |
| 1754 | |
| 1755 | if (tbl->action == start_action) |
| 1756 | break; |
| 1757 | } |
| 1758 | search_tbl->lq_type = LQ_NONE; |
| 1759 | return 0; |
| 1760 | out: |
| 1761 | lq_sta->search_better_tbl = 1; |
| 1762 | tbl->action++; |
| 1763 | if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC) |
| 1764 | tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; |
| 1765 | if (update_search_tbl_counter) |
| 1766 | search_tbl->action = tbl->action; |
| 1767 | |
| 1768 | return 0; |
| 1769 | } |
| 1770 | |
| 1771 | /* |
| 1772 | * Try to switch to new modulation mode from MIMO3 |
| 1773 | */ |
| 1774 | static int rs_move_mimo3_to_other(struct iwl_mvm *mvm, |
| 1775 | struct iwl_lq_sta *lq_sta, |
| 1776 | struct ieee80211_sta *sta, int index) |
| 1777 | { |
| 1778 | s8 is_green = lq_sta->is_green; |
| 1779 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 1780 | struct iwl_scale_tbl_info *search_tbl = |
| 1781 | &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| 1782 | struct iwl_rate_scale_data *window = &(tbl->win[index]); |
| 1783 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; |
| 1784 | u32 sz = (sizeof(struct iwl_scale_tbl_info) - |
| 1785 | (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); |
| 1786 | u8 start_action; |
| 1787 | u8 valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 1788 | u8 tx_chains_num = num_of_ant(valid_tx_ant); |
| 1789 | int ret; |
| 1790 | u8 update_search_tbl_counter = 0; |
| 1791 | |
| 1792 | start_action = tbl->action; |
| 1793 | while (1) { |
| 1794 | lq_sta->action_counter++; |
| 1795 | switch (tbl->action) { |
| 1796 | case IWL_MIMO3_SWITCH_ANTENNA1: |
| 1797 | case IWL_MIMO3_SWITCH_ANTENNA2: |
| 1798 | IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n"); |
| 1799 | |
| 1800 | if (tx_chains_num <= 3) |
| 1801 | break; |
| 1802 | |
| 1803 | if (window->success_ratio >= IWL_RS_GOOD_RATIO) |
| 1804 | break; |
| 1805 | |
| 1806 | memcpy(search_tbl, tbl, sz); |
| 1807 | if (rs_toggle_antenna(valid_tx_ant, |
| 1808 | &search_tbl->current_rate, |
| 1809 | search_tbl)) |
| 1810 | goto out; |
| 1811 | break; |
| 1812 | case IWL_MIMO3_SWITCH_SISO_A: |
| 1813 | case IWL_MIMO3_SWITCH_SISO_B: |
| 1814 | case IWL_MIMO3_SWITCH_SISO_C: |
| 1815 | IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n"); |
| 1816 | |
| 1817 | /* Set up new search table for SISO */ |
| 1818 | memcpy(search_tbl, tbl, sz); |
| 1819 | |
| 1820 | if (tbl->action == IWL_MIMO3_SWITCH_SISO_A) |
| 1821 | search_tbl->ant_type = ANT_A; |
| 1822 | else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B) |
| 1823 | search_tbl->ant_type = ANT_B; |
| 1824 | else |
| 1825 | search_tbl->ant_type = ANT_C; |
| 1826 | |
| 1827 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1828 | search_tbl->ant_type)) |
| 1829 | break; |
| 1830 | |
| 1831 | ret = rs_switch_to_siso(mvm, lq_sta, sta, |
| 1832 | search_tbl, index); |
| 1833 | if (!ret) |
| 1834 | goto out; |
| 1835 | |
| 1836 | break; |
| 1837 | |
| 1838 | case IWL_MIMO3_SWITCH_MIMO2_AB: |
| 1839 | case IWL_MIMO3_SWITCH_MIMO2_AC: |
| 1840 | case IWL_MIMO3_SWITCH_MIMO2_BC: |
| 1841 | IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n"); |
| 1842 | |
| 1843 | memcpy(search_tbl, tbl, sz); |
| 1844 | search_tbl->is_SGI = 0; |
| 1845 | if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB) |
| 1846 | search_tbl->ant_type = ANT_AB; |
| 1847 | else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC) |
| 1848 | search_tbl->ant_type = ANT_AC; |
| 1849 | else |
| 1850 | search_tbl->ant_type = ANT_BC; |
| 1851 | |
| 1852 | if (!rs_is_valid_ant(valid_tx_ant, |
| 1853 | search_tbl->ant_type)) |
| 1854 | break; |
| 1855 | |
| 1856 | ret = rs_switch_to_mimo2(mvm, lq_sta, sta, |
| 1857 | search_tbl, index); |
| 1858 | if (!ret) |
| 1859 | goto out; |
| 1860 | |
| 1861 | break; |
| 1862 | |
| 1863 | case IWL_MIMO3_SWITCH_GI: |
| 1864 | if (!tbl->is_ht40 && !(ht_cap->cap & |
| 1865 | IEEE80211_HT_CAP_SGI_20)) |
| 1866 | break; |
| 1867 | if (tbl->is_ht40 && !(ht_cap->cap & |
| 1868 | IEEE80211_HT_CAP_SGI_40)) |
| 1869 | break; |
| 1870 | |
| 1871 | IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n"); |
| 1872 | |
| 1873 | /* Set up new search table for MIMO */ |
| 1874 | memcpy(search_tbl, tbl, sz); |
| 1875 | search_tbl->is_SGI = !tbl->is_SGI; |
| 1876 | rs_set_expected_tpt_table(lq_sta, search_tbl); |
| 1877 | /* |
| 1878 | * If active table already uses the fastest possible |
| 1879 | * modulation (dual stream with short guard interval), |
| 1880 | * and it's working well, there's no need to look |
| 1881 | * for a better type of modulation! |
| 1882 | */ |
| 1883 | if (tbl->is_SGI) { |
| 1884 | s32 tpt = lq_sta->last_tpt / 100; |
| 1885 | if (tpt >= search_tbl->expected_tpt[index]) |
| 1886 | break; |
| 1887 | } |
| 1888 | search_tbl->current_rate = |
| 1889 | rate_n_flags_from_tbl(mvm, search_tbl, |
| 1890 | index, is_green); |
| 1891 | update_search_tbl_counter = 1; |
| 1892 | goto out; |
| 1893 | } |
| 1894 | tbl->action++; |
| 1895 | if (tbl->action > IWL_MIMO3_SWITCH_GI) |
| 1896 | tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; |
| 1897 | |
| 1898 | if (tbl->action == start_action) |
| 1899 | break; |
| 1900 | } |
| 1901 | search_tbl->lq_type = LQ_NONE; |
| 1902 | return 0; |
| 1903 | out: |
| 1904 | lq_sta->search_better_tbl = 1; |
| 1905 | tbl->action++; |
| 1906 | if (tbl->action > IWL_MIMO3_SWITCH_GI) |
| 1907 | tbl->action = IWL_MIMO3_SWITCH_ANTENNA1; |
| 1908 | if (update_search_tbl_counter) |
| 1909 | search_tbl->action = tbl->action; |
| 1910 | |
| 1911 | return 0; |
| 1912 | } |
| 1913 | |
| 1914 | /* |
| 1915 | * Check whether we should continue using same modulation mode, or |
| 1916 | * begin search for a new mode, based on: |
| 1917 | * 1) # tx successes or failures while using this mode |
| 1918 | * 2) # times calling this function |
| 1919 | * 3) elapsed time in this mode (not used, for now) |
| 1920 | */ |
| 1921 | static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) |
| 1922 | { |
| 1923 | struct iwl_scale_tbl_info *tbl; |
| 1924 | int i; |
| 1925 | int active_tbl; |
| 1926 | int flush_interval_passed = 0; |
| 1927 | struct iwl_mvm *mvm; |
| 1928 | |
| 1929 | mvm = lq_sta->drv; |
| 1930 | active_tbl = lq_sta->active_tbl; |
| 1931 | |
| 1932 | tbl = &(lq_sta->lq_info[active_tbl]); |
| 1933 | |
| 1934 | /* If we've been disallowing search, see if we should now allow it */ |
| 1935 | if (lq_sta->stay_in_tbl) { |
| 1936 | /* Elapsed time using current modulation mode */ |
| 1937 | if (lq_sta->flush_timer) |
| 1938 | flush_interval_passed = |
| 1939 | time_after(jiffies, |
| 1940 | (unsigned long)(lq_sta->flush_timer + |
| 1941 | IWL_RATE_SCALE_FLUSH_INTVL)); |
| 1942 | |
| 1943 | /* |
| 1944 | * Check if we should allow search for new modulation mode. |
| 1945 | * If many frames have failed or succeeded, or we've used |
| 1946 | * this same modulation for a long time, allow search, and |
| 1947 | * reset history stats that keep track of whether we should |
| 1948 | * allow a new search. Also (below) reset all bitmaps and |
| 1949 | * stats in active history. |
| 1950 | */ |
| 1951 | if (force_search || |
| 1952 | (lq_sta->total_failed > lq_sta->max_failure_limit) || |
| 1953 | (lq_sta->total_success > lq_sta->max_success_limit) || |
| 1954 | ((!lq_sta->search_better_tbl) && |
| 1955 | (lq_sta->flush_timer) && (flush_interval_passed))) { |
| 1956 | IWL_DEBUG_RATE(mvm, |
| 1957 | "LQ: stay is expired %d %d %d\n", |
| 1958 | lq_sta->total_failed, |
| 1959 | lq_sta->total_success, |
| 1960 | flush_interval_passed); |
| 1961 | |
| 1962 | /* Allow search for new mode */ |
| 1963 | lq_sta->stay_in_tbl = 0; /* only place reset */ |
| 1964 | lq_sta->total_failed = 0; |
| 1965 | lq_sta->total_success = 0; |
| 1966 | lq_sta->flush_timer = 0; |
| 1967 | /* |
| 1968 | * Else if we've used this modulation mode enough repetitions |
| 1969 | * (regardless of elapsed time or success/failure), reset |
| 1970 | * history bitmaps and rate-specific stats for all rates in |
| 1971 | * active table. |
| 1972 | */ |
| 1973 | } else { |
| 1974 | lq_sta->table_count++; |
| 1975 | if (lq_sta->table_count >= |
| 1976 | lq_sta->table_count_limit) { |
| 1977 | lq_sta->table_count = 0; |
| 1978 | |
| 1979 | IWL_DEBUG_RATE(mvm, |
| 1980 | "LQ: stay in table clear win\n"); |
| 1981 | for (i = 0; i < IWL_RATE_COUNT; i++) |
| 1982 | rs_rate_scale_clear_window( |
| 1983 | &(tbl->win[i])); |
| 1984 | } |
| 1985 | } |
| 1986 | |
| 1987 | /* If transitioning to allow "search", reset all history |
| 1988 | * bitmaps and stats in active table (this will become the new |
| 1989 | * "search" table). */ |
| 1990 | if (!lq_sta->stay_in_tbl) { |
| 1991 | for (i = 0; i < IWL_RATE_COUNT; i++) |
| 1992 | rs_rate_scale_clear_window(&(tbl->win[i])); |
| 1993 | } |
| 1994 | } |
| 1995 | } |
| 1996 | |
| 1997 | /* |
| 1998 | * setup rate table in uCode |
| 1999 | */ |
| 2000 | static void rs_update_rate_tbl(struct iwl_mvm *mvm, |
| 2001 | struct iwl_lq_sta *lq_sta, |
| 2002 | struct iwl_scale_tbl_info *tbl, |
| 2003 | int index, u8 is_green) |
| 2004 | { |
| 2005 | u32 rate; |
| 2006 | |
| 2007 | /* Update uCode's rate table. */ |
| 2008 | rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green); |
| 2009 | rs_fill_link_cmd(mvm, lq_sta, rate); |
| 2010 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); |
| 2011 | } |
| 2012 | |
| 2013 | /* |
| 2014 | * Do rate scaling and search for new modulation mode. |
| 2015 | */ |
| 2016 | static void rs_rate_scale_perform(struct iwl_mvm *mvm, |
| 2017 | struct sk_buff *skb, |
| 2018 | struct ieee80211_sta *sta, |
| 2019 | struct iwl_lq_sta *lq_sta) |
| 2020 | { |
| 2021 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 2022 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 2023 | int low = IWL_RATE_INVALID; |
| 2024 | int high = IWL_RATE_INVALID; |
| 2025 | int index; |
| 2026 | int i; |
| 2027 | struct iwl_rate_scale_data *window = NULL; |
| 2028 | int current_tpt = IWL_INVALID_VALUE; |
| 2029 | int low_tpt = IWL_INVALID_VALUE; |
| 2030 | int high_tpt = IWL_INVALID_VALUE; |
| 2031 | u32 fail_count; |
| 2032 | s8 scale_action = 0; |
| 2033 | u16 rate_mask; |
| 2034 | u8 update_lq = 0; |
| 2035 | struct iwl_scale_tbl_info *tbl, *tbl1; |
| 2036 | u16 rate_scale_index_msk = 0; |
| 2037 | u8 is_green = 0; |
| 2038 | u8 active_tbl = 0; |
| 2039 | u8 done_search = 0; |
| 2040 | u16 high_low; |
| 2041 | s32 sr; |
| 2042 | u8 tid = IWL_MAX_TID_COUNT; |
| 2043 | struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv; |
| 2044 | struct iwl_mvm_tid_data *tid_data; |
| 2045 | |
| 2046 | IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n"); |
| 2047 | |
| 2048 | /* Send management frames and NO_ACK data using lowest rate. */ |
| 2049 | /* TODO: this could probably be improved.. */ |
| 2050 | if (!ieee80211_is_data(hdr->frame_control) || |
| 2051 | info->flags & IEEE80211_TX_CTL_NO_ACK) |
| 2052 | return; |
| 2053 | |
| 2054 | lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; |
| 2055 | |
| 2056 | tid = rs_tl_add_packet(lq_sta, hdr); |
| 2057 | if ((tid != IWL_MAX_TID_COUNT) && |
| 2058 | (lq_sta->tx_agg_tid_en & (1 << tid))) { |
| 2059 | tid_data = &sta_priv->tid_data[tid]; |
| 2060 | if (tid_data->state == IWL_AGG_OFF) |
| 2061 | lq_sta->is_agg = 0; |
| 2062 | else |
| 2063 | lq_sta->is_agg = 1; |
| 2064 | } else { |
| 2065 | lq_sta->is_agg = 0; |
| 2066 | } |
| 2067 | |
| 2068 | /* |
| 2069 | * Select rate-scale / modulation-mode table to work with in |
| 2070 | * the rest of this function: "search" if searching for better |
| 2071 | * modulation mode, or "active" if doing rate scaling within a mode. |
| 2072 | */ |
| 2073 | if (!lq_sta->search_better_tbl) |
| 2074 | active_tbl = lq_sta->active_tbl; |
| 2075 | else |
| 2076 | active_tbl = 1 - lq_sta->active_tbl; |
| 2077 | |
| 2078 | tbl = &(lq_sta->lq_info[active_tbl]); |
| 2079 | if (is_legacy(tbl->lq_type)) |
| 2080 | lq_sta->is_green = 0; |
| 2081 | else |
| 2082 | lq_sta->is_green = rs_use_green(sta); |
| 2083 | is_green = lq_sta->is_green; |
| 2084 | |
| 2085 | /* current tx rate */ |
| 2086 | index = lq_sta->last_txrate_idx; |
| 2087 | |
| 2088 | IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index, |
| 2089 | tbl->lq_type); |
| 2090 | |
| 2091 | /* rates available for this association, and for modulation mode */ |
| 2092 | rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); |
| 2093 | |
| 2094 | IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask); |
| 2095 | |
| 2096 | /* mask with station rate restriction */ |
| 2097 | if (is_legacy(tbl->lq_type)) { |
| 2098 | if (lq_sta->band == IEEE80211_BAND_5GHZ) |
| 2099 | /* supp_rates has no CCK bits in A mode */ |
| 2100 | rate_scale_index_msk = (u16) (rate_mask & |
| 2101 | (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); |
| 2102 | else |
| 2103 | rate_scale_index_msk = (u16) (rate_mask & |
| 2104 | lq_sta->supp_rates); |
| 2105 | |
| 2106 | } else { |
| 2107 | rate_scale_index_msk = rate_mask; |
| 2108 | } |
| 2109 | |
| 2110 | if (!rate_scale_index_msk) |
| 2111 | rate_scale_index_msk = rate_mask; |
| 2112 | |
| 2113 | if (!((1 << index) & rate_scale_index_msk)) { |
| 2114 | IWL_ERR(mvm, "Current Rate is not valid\n"); |
| 2115 | if (lq_sta->search_better_tbl) { |
| 2116 | /* revert to active table if search table is not valid*/ |
| 2117 | tbl->lq_type = LQ_NONE; |
| 2118 | lq_sta->search_better_tbl = 0; |
| 2119 | tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 2120 | /* get "active" rate info */ |
| 2121 | index = iwl_hwrate_to_plcp_idx(tbl->current_rate); |
| 2122 | rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green); |
| 2123 | } |
| 2124 | return; |
| 2125 | } |
| 2126 | |
| 2127 | /* Get expected throughput table and history window for current rate */ |
| 2128 | if (!tbl->expected_tpt) { |
| 2129 | IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); |
| 2130 | return; |
| 2131 | } |
| 2132 | |
| 2133 | /* force user max rate if set by user */ |
| 2134 | if ((lq_sta->max_rate_idx != -1) && |
| 2135 | (lq_sta->max_rate_idx < index)) { |
| 2136 | index = lq_sta->max_rate_idx; |
| 2137 | update_lq = 1; |
| 2138 | window = &(tbl->win[index]); |
| 2139 | goto lq_update; |
| 2140 | } |
| 2141 | |
| 2142 | window = &(tbl->win[index]); |
| 2143 | |
| 2144 | /* |
| 2145 | * If there is not enough history to calculate actual average |
| 2146 | * throughput, keep analyzing results of more tx frames, without |
| 2147 | * changing rate or mode (bypass most of the rest of this function). |
| 2148 | * Set up new rate table in uCode only if old rate is not supported |
| 2149 | * in current association (use new rate found above). |
| 2150 | */ |
| 2151 | fail_count = window->counter - window->success_counter; |
| 2152 | if ((fail_count < IWL_RATE_MIN_FAILURE_TH) && |
| 2153 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { |
| 2154 | IWL_DEBUG_RATE(mvm, |
| 2155 | "LQ: still below TH. succ=%d total=%d for index %d\n", |
| 2156 | window->success_counter, window->counter, index); |
| 2157 | |
| 2158 | /* Can't calculate this yet; not enough history */ |
| 2159 | window->average_tpt = IWL_INVALID_VALUE; |
| 2160 | |
| 2161 | /* Should we stay with this modulation mode, |
| 2162 | * or search for a new one? */ |
| 2163 | rs_stay_in_table(lq_sta, false); |
| 2164 | |
| 2165 | goto out; |
| 2166 | } |
| 2167 | /* Else we have enough samples; calculate estimate of |
| 2168 | * actual average throughput */ |
| 2169 | if (window->average_tpt != ((window->success_ratio * |
| 2170 | tbl->expected_tpt[index] + 64) / 128)) { |
| 2171 | IWL_ERR(mvm, |
| 2172 | "expected_tpt should have been calculated by now\n"); |
| 2173 | window->average_tpt = ((window->success_ratio * |
| 2174 | tbl->expected_tpt[index] + 64) / 128); |
| 2175 | } |
| 2176 | |
| 2177 | /* If we are searching for better modulation mode, check success. */ |
| 2178 | if (lq_sta->search_better_tbl) { |
| 2179 | /* If good success, continue using the "search" mode; |
| 2180 | * no need to send new link quality command, since we're |
| 2181 | * continuing to use the setup that we've been trying. */ |
| 2182 | if (window->average_tpt > lq_sta->last_tpt) { |
| 2183 | IWL_DEBUG_RATE(mvm, |
| 2184 | "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n", |
| 2185 | window->success_ratio, |
| 2186 | window->average_tpt, |
| 2187 | lq_sta->last_tpt); |
| 2188 | |
| 2189 | if (!is_legacy(tbl->lq_type)) |
| 2190 | lq_sta->enable_counter = 1; |
| 2191 | |
| 2192 | /* Swap tables; "search" becomes "active" */ |
| 2193 | lq_sta->active_tbl = active_tbl; |
| 2194 | current_tpt = window->average_tpt; |
| 2195 | /* Else poor success; go back to mode in "active" table */ |
| 2196 | } else { |
| 2197 | IWL_DEBUG_RATE(mvm, |
| 2198 | "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n", |
| 2199 | window->success_ratio, |
| 2200 | window->average_tpt, |
| 2201 | lq_sta->last_tpt); |
| 2202 | |
| 2203 | /* Nullify "search" table */ |
| 2204 | tbl->lq_type = LQ_NONE; |
| 2205 | |
| 2206 | /* Revert to "active" table */ |
| 2207 | active_tbl = lq_sta->active_tbl; |
| 2208 | tbl = &(lq_sta->lq_info[active_tbl]); |
| 2209 | |
| 2210 | /* Revert to "active" rate and throughput info */ |
| 2211 | index = iwl_hwrate_to_plcp_idx(tbl->current_rate); |
| 2212 | current_tpt = lq_sta->last_tpt; |
| 2213 | |
| 2214 | /* Need to set up a new rate table in uCode */ |
| 2215 | update_lq = 1; |
| 2216 | } |
| 2217 | |
| 2218 | /* Either way, we've made a decision; modulation mode |
| 2219 | * search is done, allow rate adjustment next time. */ |
| 2220 | lq_sta->search_better_tbl = 0; |
| 2221 | done_search = 1; /* Don't switch modes below! */ |
| 2222 | goto lq_update; |
| 2223 | } |
| 2224 | |
| 2225 | /* (Else) not in search of better modulation mode, try for better |
| 2226 | * starting rate, while staying in this mode. */ |
| 2227 | high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk, |
| 2228 | tbl->lq_type); |
| 2229 | low = high_low & 0xff; |
| 2230 | high = (high_low >> 8) & 0xff; |
| 2231 | |
| 2232 | /* If user set max rate, dont allow higher than user constrain */ |
| 2233 | if ((lq_sta->max_rate_idx != -1) && |
| 2234 | (lq_sta->max_rate_idx < high)) |
| 2235 | high = IWL_RATE_INVALID; |
| 2236 | |
| 2237 | sr = window->success_ratio; |
| 2238 | |
| 2239 | /* Collect measured throughputs for current and adjacent rates */ |
| 2240 | current_tpt = window->average_tpt; |
| 2241 | if (low != IWL_RATE_INVALID) |
| 2242 | low_tpt = tbl->win[low].average_tpt; |
| 2243 | if (high != IWL_RATE_INVALID) |
| 2244 | high_tpt = tbl->win[high].average_tpt; |
| 2245 | |
| 2246 | scale_action = 0; |
| 2247 | |
| 2248 | /* Too many failures, decrease rate */ |
| 2249 | if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { |
| 2250 | IWL_DEBUG_RATE(mvm, |
| 2251 | "decrease rate because of low success_ratio\n"); |
| 2252 | scale_action = -1; |
| 2253 | /* No throughput measured yet for adjacent rates; try increase. */ |
| 2254 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
| 2255 | (high_tpt == IWL_INVALID_VALUE)) { |
| 2256 | if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) |
| 2257 | scale_action = 1; |
| 2258 | else if (low != IWL_RATE_INVALID) |
| 2259 | scale_action = 0; |
| 2260 | } |
| 2261 | |
| 2262 | /* Both adjacent throughputs are measured, but neither one has better |
| 2263 | * throughput; we're using the best rate, don't change it! */ |
| 2264 | else if ((low_tpt != IWL_INVALID_VALUE) && |
| 2265 | (high_tpt != IWL_INVALID_VALUE) && |
| 2266 | (low_tpt < current_tpt) && |
| 2267 | (high_tpt < current_tpt)) |
| 2268 | scale_action = 0; |
| 2269 | |
| 2270 | /* At least one adjacent rate's throughput is measured, |
| 2271 | * and may have better performance. */ |
| 2272 | else { |
| 2273 | /* Higher adjacent rate's throughput is measured */ |
| 2274 | if (high_tpt != IWL_INVALID_VALUE) { |
| 2275 | /* Higher rate has better throughput */ |
| 2276 | if (high_tpt > current_tpt && |
| 2277 | sr >= IWL_RATE_INCREASE_TH) { |
| 2278 | scale_action = 1; |
| 2279 | } else { |
| 2280 | scale_action = 0; |
| 2281 | } |
| 2282 | |
| 2283 | /* Lower adjacent rate's throughput is measured */ |
| 2284 | } else if (low_tpt != IWL_INVALID_VALUE) { |
| 2285 | /* Lower rate has better throughput */ |
| 2286 | if (low_tpt > current_tpt) { |
| 2287 | IWL_DEBUG_RATE(mvm, |
| 2288 | "decrease rate because of low tpt\n"); |
| 2289 | scale_action = -1; |
| 2290 | } else if (sr >= IWL_RATE_INCREASE_TH) { |
| 2291 | scale_action = 1; |
| 2292 | } |
| 2293 | } |
| 2294 | } |
| 2295 | |
| 2296 | /* Sanity check; asked for decrease, but success rate or throughput |
| 2297 | * has been good at old rate. Don't change it. */ |
| 2298 | if ((scale_action == -1) && (low != IWL_RATE_INVALID) && |
| 2299 | ((sr > IWL_RATE_HIGH_TH) || |
| 2300 | (current_tpt > (100 * tbl->expected_tpt[low])))) |
| 2301 | scale_action = 0; |
| 2302 | |
| 2303 | switch (scale_action) { |
| 2304 | case -1: |
| 2305 | /* Decrease starting rate, update uCode's rate table */ |
| 2306 | if (low != IWL_RATE_INVALID) { |
| 2307 | update_lq = 1; |
| 2308 | index = low; |
| 2309 | } |
| 2310 | |
| 2311 | break; |
| 2312 | case 1: |
| 2313 | /* Increase starting rate, update uCode's rate table */ |
| 2314 | if (high != IWL_RATE_INVALID) { |
| 2315 | update_lq = 1; |
| 2316 | index = high; |
| 2317 | } |
| 2318 | |
| 2319 | break; |
| 2320 | case 0: |
| 2321 | /* No change */ |
| 2322 | default: |
| 2323 | break; |
| 2324 | } |
| 2325 | |
| 2326 | IWL_DEBUG_RATE(mvm, |
| 2327 | "choose rate scale index %d action %d low %d high %d type %d\n", |
| 2328 | index, scale_action, low, high, tbl->lq_type); |
| 2329 | |
| 2330 | lq_update: |
| 2331 | /* Replace uCode's rate table for the destination station. */ |
| 2332 | if (update_lq) |
| 2333 | rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green); |
| 2334 | |
| 2335 | rs_stay_in_table(lq_sta, false); |
| 2336 | |
| 2337 | /* |
| 2338 | * Search for new modulation mode if we're: |
| 2339 | * 1) Not changing rates right now |
| 2340 | * 2) Not just finishing up a search |
| 2341 | * 3) Allowing a new search |
| 2342 | */ |
| 2343 | if (!update_lq && !done_search && |
| 2344 | !lq_sta->stay_in_tbl && window->counter) { |
| 2345 | /* Save current throughput to compare with "search" throughput*/ |
| 2346 | lq_sta->last_tpt = current_tpt; |
| 2347 | |
| 2348 | /* Select a new "search" modulation mode to try. |
| 2349 | * If one is found, set up the new "search" table. */ |
| 2350 | if (is_legacy(tbl->lq_type)) |
| 2351 | rs_move_legacy_other(mvm, lq_sta, sta, index); |
| 2352 | else if (is_siso(tbl->lq_type)) |
| 2353 | rs_move_siso_to_other(mvm, lq_sta, sta, index); |
| 2354 | else if (is_mimo2(tbl->lq_type)) |
| 2355 | rs_move_mimo2_to_other(mvm, lq_sta, sta, index); |
| 2356 | else |
| 2357 | rs_move_mimo3_to_other(mvm, lq_sta, sta, index); |
| 2358 | |
| 2359 | /* If new "search" mode was selected, set up in uCode table */ |
| 2360 | if (lq_sta->search_better_tbl) { |
| 2361 | /* Access the "search" table, clear its history. */ |
| 2362 | tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); |
| 2363 | for (i = 0; i < IWL_RATE_COUNT; i++) |
| 2364 | rs_rate_scale_clear_window(&(tbl->win[i])); |
| 2365 | |
| 2366 | /* Use new "search" start rate */ |
| 2367 | index = iwl_hwrate_to_plcp_idx(tbl->current_rate); |
| 2368 | |
| 2369 | IWL_DEBUG_RATE(mvm, |
| 2370 | "Switch current mcs: %X index: %d\n", |
| 2371 | tbl->current_rate, index); |
| 2372 | rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate); |
| 2373 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false); |
| 2374 | } else { |
| 2375 | done_search = 1; |
| 2376 | } |
| 2377 | } |
| 2378 | |
| 2379 | if (done_search && !lq_sta->stay_in_tbl) { |
| 2380 | /* If the "active" (non-search) mode was legacy, |
| 2381 | * and we've tried switching antennas, |
| 2382 | * but we haven't been able to try HT modes (not available), |
| 2383 | * stay with best antenna legacy modulation for a while |
| 2384 | * before next round of mode comparisons. */ |
| 2385 | tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 2386 | if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported && |
| 2387 | lq_sta->action_counter > tbl1->max_search) { |
| 2388 | IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); |
| 2389 | rs_set_stay_in_table(mvm, 1, lq_sta); |
| 2390 | } |
| 2391 | |
| 2392 | /* If we're in an HT mode, and all 3 mode switch actions |
| 2393 | * have been tried and compared, stay in this best modulation |
| 2394 | * mode for a while before next round of mode comparisons. */ |
| 2395 | if (lq_sta->enable_counter && |
| 2396 | (lq_sta->action_counter >= tbl1->max_search)) { |
| 2397 | if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && |
| 2398 | (lq_sta->tx_agg_tid_en & (1 << tid)) && |
| 2399 | (tid != IWL_MAX_TID_COUNT)) { |
| 2400 | tid_data = &sta_priv->tid_data[tid]; |
| 2401 | if (tid_data->state == IWL_AGG_OFF) { |
| 2402 | IWL_DEBUG_RATE(mvm, |
| 2403 | "try to aggregate tid %d\n", |
| 2404 | tid); |
| 2405 | rs_tl_turn_on_agg(mvm, tid, |
| 2406 | lq_sta, sta); |
| 2407 | } |
| 2408 | } |
| 2409 | rs_set_stay_in_table(mvm, 0, lq_sta); |
| 2410 | } |
| 2411 | } |
| 2412 | |
| 2413 | out: |
| 2414 | tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green); |
| 2415 | lq_sta->last_txrate_idx = index; |
| 2416 | } |
| 2417 | |
| 2418 | /** |
| 2419 | * rs_initialize_lq - Initialize a station's hardware rate table |
| 2420 | * |
| 2421 | * The uCode's station table contains a table of fallback rates |
| 2422 | * for automatic fallback during transmission. |
| 2423 | * |
| 2424 | * NOTE: This sets up a default set of values. These will be replaced later |
| 2425 | * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of |
| 2426 | * rc80211_simple. |
| 2427 | * |
| 2428 | * NOTE: Run REPLY_ADD_STA command to set up station table entry, before |
| 2429 | * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, |
| 2430 | * which requires station table entry to exist). |
| 2431 | */ |
| 2432 | static void rs_initialize_lq(struct iwl_mvm *mvm, |
| 2433 | struct ieee80211_sta *sta, |
| 2434 | struct iwl_lq_sta *lq_sta, |
| 2435 | enum ieee80211_band band) |
| 2436 | { |
| 2437 | struct iwl_scale_tbl_info *tbl; |
| 2438 | int rate_idx; |
| 2439 | int i; |
| 2440 | u32 rate; |
| 2441 | u8 use_green = rs_use_green(sta); |
| 2442 | u8 active_tbl = 0; |
| 2443 | u8 valid_tx_ant; |
| 2444 | |
| 2445 | if (!sta || !lq_sta) |
| 2446 | return; |
| 2447 | |
| 2448 | i = lq_sta->last_txrate_idx; |
| 2449 | |
| 2450 | valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 2451 | |
| 2452 | if (!lq_sta->search_better_tbl) |
| 2453 | active_tbl = lq_sta->active_tbl; |
| 2454 | else |
| 2455 | active_tbl = 1 - lq_sta->active_tbl; |
| 2456 | |
| 2457 | tbl = &(lq_sta->lq_info[active_tbl]); |
| 2458 | |
| 2459 | if ((i < 0) || (i >= IWL_RATE_COUNT)) |
| 2460 | i = 0; |
| 2461 | |
| 2462 | rate = iwl_rates[i].plcp; |
| 2463 | tbl->ant_type = first_antenna(valid_tx_ant); |
| 2464 | rate |= tbl->ant_type << RATE_MCS_ANT_POS; |
| 2465 | |
| 2466 | if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) |
| 2467 | rate |= RATE_MCS_CCK_MSK; |
| 2468 | |
| 2469 | rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx); |
| 2470 | if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) |
| 2471 | rs_toggle_antenna(valid_tx_ant, &rate, tbl); |
| 2472 | |
| 2473 | rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green); |
| 2474 | tbl->current_rate = rate; |
| 2475 | rs_set_expected_tpt_table(lq_sta, tbl); |
| 2476 | rs_fill_link_cmd(NULL, lq_sta, rate); |
| 2477 | /* TODO restore station should remember the lq cmd */ |
| 2478 | iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true); |
| 2479 | } |
| 2480 | |
| 2481 | static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, |
| 2482 | struct ieee80211_tx_rate_control *txrc) |
| 2483 | { |
| 2484 | struct sk_buff *skb = txrc->skb; |
| 2485 | struct ieee80211_supported_band *sband = txrc->sband; |
| 2486 | struct iwl_op_mode *op_mode __maybe_unused = |
| 2487 | (struct iwl_op_mode *)mvm_r; |
| 2488 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); |
| 2489 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 2490 | struct iwl_lq_sta *lq_sta = mvm_sta; |
| 2491 | int rate_idx; |
| 2492 | |
| 2493 | IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n"); |
| 2494 | |
| 2495 | /* Get max rate if user set max rate */ |
| 2496 | if (lq_sta) { |
| 2497 | lq_sta->max_rate_idx = txrc->max_rate_idx; |
| 2498 | if ((sband->band == IEEE80211_BAND_5GHZ) && |
| 2499 | (lq_sta->max_rate_idx != -1)) |
| 2500 | lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; |
| 2501 | if ((lq_sta->max_rate_idx < 0) || |
| 2502 | (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) |
| 2503 | lq_sta->max_rate_idx = -1; |
| 2504 | } |
| 2505 | |
| 2506 | /* Treat uninitialized rate scaling data same as non-existing. */ |
| 2507 | if (lq_sta && !lq_sta->drv) { |
| 2508 | IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); |
| 2509 | mvm_sta = NULL; |
| 2510 | } |
| 2511 | |
| 2512 | /* Send management frames and NO_ACK data using lowest rate. */ |
| 2513 | if (rate_control_send_low(sta, mvm_sta, txrc)) |
| 2514 | return; |
| 2515 | |
| 2516 | rate_idx = lq_sta->last_txrate_idx; |
| 2517 | |
| 2518 | if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) { |
| 2519 | rate_idx -= IWL_FIRST_OFDM_RATE; |
| 2520 | /* 6M and 9M shared same MCS index */ |
| 2521 | rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0; |
| 2522 | if (rs_extract_rate(lq_sta->last_rate_n_flags) >= |
| 2523 | IWL_RATE_MIMO3_6M_PLCP) |
| 2524 | rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM); |
| 2525 | else if (rs_extract_rate(lq_sta->last_rate_n_flags) >= |
| 2526 | IWL_RATE_MIMO2_6M_PLCP) |
| 2527 | rate_idx = rate_idx + MCS_INDEX_PER_STREAM; |
| 2528 | info->control.rates[0].flags = IEEE80211_TX_RC_MCS; |
| 2529 | if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK) |
| 2530 | info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI; |
| 2531 | if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */ |
| 2532 | info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
| 2533 | if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK) |
| 2534 | info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD; |
| 2535 | } else { |
| 2536 | /* Check for invalid rates */ |
| 2537 | if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) || |
| 2538 | ((sband->band == IEEE80211_BAND_5GHZ) && |
| 2539 | (rate_idx < IWL_FIRST_OFDM_RATE))) |
| 2540 | rate_idx = rate_lowest_index(sband, sta); |
| 2541 | /* On valid 5 GHz rate, adjust index */ |
| 2542 | else if (sband->band == IEEE80211_BAND_5GHZ) |
| 2543 | rate_idx -= IWL_FIRST_OFDM_RATE; |
| 2544 | info->control.rates[0].flags = 0; |
| 2545 | } |
| 2546 | info->control.rates[0].idx = rate_idx; |
| 2547 | } |
| 2548 | |
| 2549 | static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, |
| 2550 | gfp_t gfp) |
| 2551 | { |
| 2552 | struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; |
| 2553 | struct iwl_op_mode *op_mode __maybe_unused = |
| 2554 | (struct iwl_op_mode *)mvm_rate; |
| 2555 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); |
| 2556 | |
| 2557 | IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); |
| 2558 | |
| 2559 | return &sta_priv->lq_sta; |
| 2560 | } |
| 2561 | |
| 2562 | /* |
| 2563 | * Called after adding a new station to initialize rate scaling |
| 2564 | */ |
| 2565 | void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, |
| 2566 | enum ieee80211_band band) |
| 2567 | { |
| 2568 | int i, j; |
| 2569 | struct ieee80211_hw *hw = mvm->hw; |
| 2570 | struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; |
| 2571 | struct iwl_mvm_sta *sta_priv; |
| 2572 | struct iwl_lq_sta *lq_sta; |
| 2573 | struct ieee80211_supported_band *sband; |
| 2574 | unsigned long supp; /* must be unsigned long for for_each_set_bit */ |
| 2575 | |
| 2576 | sta_priv = (struct iwl_mvm_sta *)sta->drv_priv; |
| 2577 | lq_sta = &sta_priv->lq_sta; |
| 2578 | sband = hw->wiphy->bands[band]; |
| 2579 | |
| 2580 | lq_sta->lq.sta_id = sta_priv->sta_id; |
| 2581 | |
| 2582 | for (j = 0; j < LQ_SIZE; j++) |
| 2583 | for (i = 0; i < IWL_RATE_COUNT; i++) |
| 2584 | rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); |
| 2585 | |
| 2586 | lq_sta->flush_timer = 0; |
| 2587 | lq_sta->supp_rates = sta->supp_rates[sband->band]; |
| 2588 | for (j = 0; j < LQ_SIZE; j++) |
| 2589 | for (i = 0; i < IWL_RATE_COUNT; i++) |
| 2590 | rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); |
| 2591 | |
| 2592 | IWL_DEBUG_RATE(mvm, |
| 2593 | "LQ: *** rate scale station global init for station %d ***\n", |
| 2594 | sta_priv->sta_id); |
| 2595 | /* TODO: what is a good starting rate for STA? About middle? Maybe not |
| 2596 | * the lowest or the highest rate.. Could consider using RSSI from |
| 2597 | * previous packets? Need to have IEEE 802.1X auth succeed immediately |
| 2598 | * after assoc.. */ |
| 2599 | |
| 2600 | lq_sta->max_rate_idx = -1; |
| 2601 | lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; |
| 2602 | lq_sta->is_green = rs_use_green(sta); |
| 2603 | lq_sta->band = sband->band; |
| 2604 | /* |
| 2605 | * active legacy rates as per supported rates bitmap |
| 2606 | */ |
| 2607 | supp = sta->supp_rates[sband->band]; |
| 2608 | lq_sta->active_legacy_rate = 0; |
| 2609 | for_each_set_bit(i, &supp, BITS_PER_LONG) |
| 2610 | lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); |
| 2611 | |
| 2612 | /* |
| 2613 | * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3), |
| 2614 | * supp_rates[] does not; shift to convert format, force 9 MBits off. |
| 2615 | */ |
| 2616 | lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; |
| 2617 | lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; |
| 2618 | lq_sta->active_siso_rate &= ~((u16)0x2); |
| 2619 | lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; |
| 2620 | |
| 2621 | /* Same here */ |
| 2622 | lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; |
| 2623 | lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; |
| 2624 | lq_sta->active_mimo2_rate &= ~((u16)0x2); |
| 2625 | lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; |
| 2626 | |
| 2627 | lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1; |
| 2628 | lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1; |
| 2629 | lq_sta->active_mimo3_rate &= ~((u16)0x2); |
| 2630 | lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; |
| 2631 | |
| 2632 | IWL_DEBUG_RATE(mvm, |
| 2633 | "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", |
| 2634 | lq_sta->active_siso_rate, |
| 2635 | lq_sta->active_mimo2_rate, |
| 2636 | lq_sta->active_mimo3_rate); |
| 2637 | |
| 2638 | /* These values will be overridden later */ |
| 2639 | lq_sta->lq.single_stream_ant_msk = |
| 2640 | first_antenna(mvm->nvm_data->valid_tx_ant); |
| 2641 | lq_sta->lq.dual_stream_ant_msk = |
| 2642 | mvm->nvm_data->valid_tx_ant & |
| 2643 | ~first_antenna(mvm->nvm_data->valid_tx_ant); |
| 2644 | if (!lq_sta->lq.dual_stream_ant_msk) { |
| 2645 | lq_sta->lq.dual_stream_ant_msk = ANT_AB; |
| 2646 | } else if (num_of_ant(mvm->nvm_data->valid_tx_ant) == 2) { |
| 2647 | lq_sta->lq.dual_stream_ant_msk = |
| 2648 | mvm->nvm_data->valid_tx_ant; |
| 2649 | } |
| 2650 | |
| 2651 | /* as default allow aggregation for all tids */ |
| 2652 | lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; |
| 2653 | lq_sta->drv = mvm; |
| 2654 | |
| 2655 | /* Set last_txrate_idx to lowest rate */ |
| 2656 | lq_sta->last_txrate_idx = rate_lowest_index(sband, sta); |
| 2657 | if (sband->band == IEEE80211_BAND_5GHZ) |
| 2658 | lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
| 2659 | lq_sta->is_agg = 0; |
| 2660 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 2661 | lq_sta->dbg_fixed_rate = 0; |
| 2662 | #endif |
| 2663 | |
| 2664 | rs_initialize_lq(mvm, sta, lq_sta, band); |
| 2665 | } |
| 2666 | |
| 2667 | static void rs_fill_link_cmd(struct iwl_mvm *mvm, |
| 2668 | struct iwl_lq_sta *lq_sta, u32 new_rate) |
| 2669 | { |
| 2670 | struct iwl_scale_tbl_info tbl_type; |
| 2671 | int index = 0; |
| 2672 | int rate_idx; |
| 2673 | int repeat_rate = 0; |
| 2674 | u8 ant_toggle_cnt = 0; |
| 2675 | u8 use_ht_possible = 1; |
| 2676 | u8 valid_tx_ant = 0; |
| 2677 | struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; |
| 2678 | |
| 2679 | /* Override starting rate (index 0) if needed for debug purposes */ |
| 2680 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); |
| 2681 | |
| 2682 | /* Interpret new_rate (rate_n_flags) */ |
| 2683 | rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, |
| 2684 | &tbl_type, &rate_idx); |
| 2685 | |
| 2686 | /* How many times should we repeat the initial rate? */ |
| 2687 | if (is_legacy(tbl_type.lq_type)) { |
| 2688 | ant_toggle_cnt = 1; |
| 2689 | repeat_rate = IWL_NUMBER_TRY; |
| 2690 | } else { |
| 2691 | repeat_rate = min(IWL_HT_NUMBER_TRY, |
| 2692 | LINK_QUAL_AGG_DISABLE_START_DEF - 1); |
| 2693 | } |
| 2694 | |
| 2695 | lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0; |
| 2696 | |
| 2697 | /* Fill 1st table entry (index 0) */ |
| 2698 | lq_cmd->rs_table[index] = cpu_to_le32(new_rate); |
| 2699 | |
| 2700 | if (num_of_ant(tbl_type.ant_type) == 1) |
| 2701 | lq_cmd->single_stream_ant_msk = tbl_type.ant_type; |
| 2702 | else if (num_of_ant(tbl_type.ant_type) == 2) |
| 2703 | lq_cmd->dual_stream_ant_msk = tbl_type.ant_type; |
| 2704 | /* otherwise we don't modify the existing value */ |
| 2705 | |
| 2706 | index++; |
| 2707 | repeat_rate--; |
| 2708 | if (mvm) |
| 2709 | valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 2710 | |
| 2711 | /* Fill rest of rate table */ |
| 2712 | while (index < LINK_QUAL_MAX_RETRY_NUM) { |
| 2713 | /* Repeat initial/next rate. |
| 2714 | * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. |
| 2715 | * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ |
| 2716 | while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { |
| 2717 | if (is_legacy(tbl_type.lq_type)) { |
| 2718 | if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) |
| 2719 | ant_toggle_cnt++; |
| 2720 | else if (mvm && |
| 2721 | rs_toggle_antenna(valid_tx_ant, |
| 2722 | &new_rate, &tbl_type)) |
| 2723 | ant_toggle_cnt = 1; |
| 2724 | } |
| 2725 | |
| 2726 | /* Override next rate if needed for debug purposes */ |
| 2727 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); |
| 2728 | |
| 2729 | /* Fill next table entry */ |
| 2730 | lq_cmd->rs_table[index] = |
| 2731 | cpu_to_le32(new_rate); |
| 2732 | repeat_rate--; |
| 2733 | index++; |
| 2734 | } |
| 2735 | |
| 2736 | rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, |
| 2737 | &rate_idx); |
| 2738 | |
| 2739 | |
| 2740 | /* Indicate to uCode which entries might be MIMO. |
| 2741 | * If initial rate was MIMO, this will finally end up |
| 2742 | * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ |
| 2743 | if (is_mimo(tbl_type.lq_type)) |
| 2744 | lq_cmd->mimo_delim = index; |
| 2745 | |
| 2746 | /* Get next rate */ |
| 2747 | new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, |
| 2748 | use_ht_possible); |
| 2749 | |
| 2750 | /* How many times should we repeat the next rate? */ |
| 2751 | if (is_legacy(tbl_type.lq_type)) { |
| 2752 | if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) |
| 2753 | ant_toggle_cnt++; |
| 2754 | else if (mvm && |
| 2755 | rs_toggle_antenna(valid_tx_ant, |
| 2756 | &new_rate, &tbl_type)) |
| 2757 | ant_toggle_cnt = 1; |
| 2758 | |
| 2759 | repeat_rate = IWL_NUMBER_TRY; |
| 2760 | } else { |
| 2761 | repeat_rate = IWL_HT_NUMBER_TRY; |
| 2762 | } |
| 2763 | |
| 2764 | /* Don't allow HT rates after next pass. |
| 2765 | * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ |
| 2766 | use_ht_possible = 0; |
| 2767 | |
| 2768 | /* Override next rate if needed for debug purposes */ |
| 2769 | rs_dbgfs_set_mcs(lq_sta, &new_rate, index); |
| 2770 | |
| 2771 | /* Fill next table entry */ |
| 2772 | lq_cmd->rs_table[index] = cpu_to_le32(new_rate); |
| 2773 | |
| 2774 | index++; |
| 2775 | repeat_rate--; |
| 2776 | } |
| 2777 | |
| 2778 | lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; |
| 2779 | lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF; |
| 2780 | |
| 2781 | lq_cmd->agg_time_limit = |
| 2782 | cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF); |
| 2783 | } |
| 2784 | |
| 2785 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
| 2786 | { |
| 2787 | return hw->priv; |
| 2788 | } |
| 2789 | /* rate scale requires free function to be implemented */ |
| 2790 | static void rs_free(void *mvm_rate) |
| 2791 | { |
| 2792 | return; |
| 2793 | } |
| 2794 | |
| 2795 | static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, |
| 2796 | void *mvm_sta) |
| 2797 | { |
| 2798 | struct iwl_op_mode *op_mode __maybe_unused = mvm_r; |
| 2799 | struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); |
| 2800 | |
| 2801 | IWL_DEBUG_RATE(mvm, "enter\n"); |
| 2802 | IWL_DEBUG_RATE(mvm, "leave\n"); |
| 2803 | } |
| 2804 | |
| 2805 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 2806 | static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, |
| 2807 | u32 *rate_n_flags, int index) |
| 2808 | { |
| 2809 | struct iwl_mvm *mvm; |
| 2810 | u8 valid_tx_ant; |
| 2811 | u8 ant_sel_tx; |
| 2812 | |
| 2813 | mvm = lq_sta->drv; |
| 2814 | valid_tx_ant = mvm->nvm_data->valid_tx_ant; |
| 2815 | if (lq_sta->dbg_fixed_rate) { |
| 2816 | ant_sel_tx = |
| 2817 | ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) |
| 2818 | >> RATE_MCS_ANT_POS); |
| 2819 | if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) { |
| 2820 | *rate_n_flags = lq_sta->dbg_fixed_rate; |
| 2821 | IWL_DEBUG_RATE(mvm, "Fixed rate ON\n"); |
| 2822 | } else { |
| 2823 | lq_sta->dbg_fixed_rate = 0; |
| 2824 | IWL_ERR(mvm, |
| 2825 | "Invalid antenna selection 0x%X, Valid is 0x%X\n", |
| 2826 | ant_sel_tx, valid_tx_ant); |
| 2827 | IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n"); |
| 2828 | } |
| 2829 | } else { |
| 2830 | IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n"); |
| 2831 | } |
| 2832 | } |
| 2833 | |
| 2834 | static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, |
| 2835 | const char __user *user_buf, size_t count, loff_t *ppos) |
| 2836 | { |
| 2837 | struct iwl_lq_sta *lq_sta = file->private_data; |
| 2838 | struct iwl_mvm *mvm; |
| 2839 | char buf[64]; |
| 2840 | size_t buf_size; |
| 2841 | u32 parsed_rate; |
| 2842 | |
| 2843 | |
| 2844 | mvm = lq_sta->drv; |
| 2845 | memset(buf, 0, sizeof(buf)); |
| 2846 | buf_size = min(count, sizeof(buf) - 1); |
| 2847 | if (copy_from_user(buf, user_buf, buf_size)) |
| 2848 | return -EFAULT; |
| 2849 | |
| 2850 | if (sscanf(buf, "%x", &parsed_rate) == 1) |
| 2851 | lq_sta->dbg_fixed_rate = parsed_rate; |
| 2852 | else |
| 2853 | lq_sta->dbg_fixed_rate = 0; |
| 2854 | |
| 2855 | rs_program_fix_rate(mvm, lq_sta); |
| 2856 | |
| 2857 | return count; |
| 2858 | } |
| 2859 | |
| 2860 | static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, |
| 2861 | char __user *user_buf, size_t count, loff_t *ppos) |
| 2862 | { |
| 2863 | char *buff; |
| 2864 | int desc = 0; |
| 2865 | int i = 0; |
| 2866 | int index = 0; |
| 2867 | ssize_t ret; |
| 2868 | |
| 2869 | struct iwl_lq_sta *lq_sta = file->private_data; |
| 2870 | struct iwl_mvm *mvm; |
| 2871 | struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); |
| 2872 | |
| 2873 | mvm = lq_sta->drv; |
| 2874 | buff = kmalloc(1024, GFP_KERNEL); |
| 2875 | if (!buff) |
| 2876 | return -ENOMEM; |
| 2877 | |
| 2878 | desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); |
| 2879 | desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", |
| 2880 | lq_sta->total_failed, lq_sta->total_success, |
| 2881 | lq_sta->active_legacy_rate); |
| 2882 | desc += sprintf(buff+desc, "fixed rate 0x%X\n", |
| 2883 | lq_sta->dbg_fixed_rate); |
| 2884 | desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", |
| 2885 | (mvm->nvm_data->valid_tx_ant & ANT_A) ? "ANT_A," : "", |
| 2886 | (mvm->nvm_data->valid_tx_ant & ANT_B) ? "ANT_B," : "", |
| 2887 | (mvm->nvm_data->valid_tx_ant & ANT_C) ? "ANT_C" : ""); |
| 2888 | desc += sprintf(buff+desc, "lq type %s\n", |
| 2889 | (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); |
| 2890 | if (is_Ht(tbl->lq_type)) { |
| 2891 | desc += sprintf(buff+desc, " %s", |
| 2892 | (is_siso(tbl->lq_type)) ? "SISO" : |
| 2893 | ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); |
| 2894 | desc += sprintf(buff+desc, " %s", |
| 2895 | (tbl->is_ht40) ? "40MHz" : "20MHz"); |
| 2896 | desc += sprintf(buff+desc, " %s %s %s\n", |
| 2897 | (tbl->is_SGI) ? "SGI" : "", |
| 2898 | (lq_sta->is_green) ? "GF enabled" : "", |
| 2899 | (lq_sta->is_agg) ? "AGG on" : ""); |
| 2900 | } |
| 2901 | desc += sprintf(buff+desc, "last tx rate=0x%X\n", |
| 2902 | lq_sta->last_rate_n_flags); |
| 2903 | desc += sprintf(buff+desc, |
| 2904 | "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", |
| 2905 | lq_sta->lq.flags, |
| 2906 | lq_sta->lq.mimo_delim, |
| 2907 | lq_sta->lq.single_stream_ant_msk, |
| 2908 | lq_sta->lq.dual_stream_ant_msk); |
| 2909 | |
| 2910 | desc += sprintf(buff+desc, |
| 2911 | "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", |
| 2912 | le16_to_cpu(lq_sta->lq.agg_time_limit), |
| 2913 | lq_sta->lq.agg_disable_start_th, |
| 2914 | lq_sta->lq.agg_frame_cnt_limit); |
| 2915 | |
| 2916 | desc += sprintf(buff+desc, |
| 2917 | "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", |
| 2918 | lq_sta->lq.initial_rate_index[0], |
| 2919 | lq_sta->lq.initial_rate_index[1], |
| 2920 | lq_sta->lq.initial_rate_index[2], |
| 2921 | lq_sta->lq.initial_rate_index[3]); |
| 2922 | |
| 2923 | for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { |
| 2924 | index = iwl_hwrate_to_plcp_idx( |
| 2925 | le32_to_cpu(lq_sta->lq.rs_table[i])); |
| 2926 | if (is_legacy(tbl->lq_type)) { |
| 2927 | desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n", |
| 2928 | i, le32_to_cpu(lq_sta->lq.rs_table[i]), |
| 2929 | iwl_rate_mcs[index].mbps); |
| 2930 | } else { |
| 2931 | desc += sprintf(buff+desc, |
| 2932 | " rate[%d] 0x%X %smbps (%s)\n", |
| 2933 | i, le32_to_cpu(lq_sta->lq.rs_table[i]), |
| 2934 | iwl_rate_mcs[index].mbps, |
| 2935 | iwl_rate_mcs[index].mcs); |
| 2936 | } |
| 2937 | } |
| 2938 | |
| 2939 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
| 2940 | kfree(buff); |
| 2941 | return ret; |
| 2942 | } |
| 2943 | |
| 2944 | static const struct file_operations rs_sta_dbgfs_scale_table_ops = { |
| 2945 | .write = rs_sta_dbgfs_scale_table_write, |
| 2946 | .read = rs_sta_dbgfs_scale_table_read, |
| 2947 | .open = simple_open, |
| 2948 | .llseek = default_llseek, |
| 2949 | }; |
| 2950 | static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, |
| 2951 | char __user *user_buf, size_t count, loff_t *ppos) |
| 2952 | { |
| 2953 | char *buff; |
| 2954 | int desc = 0; |
| 2955 | int i, j; |
| 2956 | ssize_t ret; |
| 2957 | |
| 2958 | struct iwl_lq_sta *lq_sta = file->private_data; |
| 2959 | |
| 2960 | buff = kmalloc(1024, GFP_KERNEL); |
| 2961 | if (!buff) |
| 2962 | return -ENOMEM; |
| 2963 | |
| 2964 | for (i = 0; i < LQ_SIZE; i++) { |
| 2965 | desc += sprintf(buff+desc, |
| 2966 | "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n" |
| 2967 | "rate=0x%X\n", |
| 2968 | lq_sta->active_tbl == i ? "*" : "x", |
| 2969 | lq_sta->lq_info[i].lq_type, |
| 2970 | lq_sta->lq_info[i].is_SGI, |
| 2971 | lq_sta->lq_info[i].is_ht40, |
| 2972 | lq_sta->is_green, |
| 2973 | lq_sta->lq_info[i].current_rate); |
| 2974 | for (j = 0; j < IWL_RATE_COUNT; j++) { |
| 2975 | desc += sprintf(buff+desc, |
| 2976 | "counter=%d success=%d %%=%d\n", |
| 2977 | lq_sta->lq_info[i].win[j].counter, |
| 2978 | lq_sta->lq_info[i].win[j].success_counter, |
| 2979 | lq_sta->lq_info[i].win[j].success_ratio); |
| 2980 | } |
| 2981 | } |
| 2982 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
| 2983 | kfree(buff); |
| 2984 | return ret; |
| 2985 | } |
| 2986 | |
| 2987 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { |
| 2988 | .read = rs_sta_dbgfs_stats_table_read, |
| 2989 | .open = simple_open, |
| 2990 | .llseek = default_llseek, |
| 2991 | }; |
| 2992 | |
| 2993 | static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file, |
| 2994 | char __user *user_buf, size_t count, loff_t *ppos) |
| 2995 | { |
| 2996 | struct iwl_lq_sta *lq_sta = file->private_data; |
| 2997 | struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; |
| 2998 | char buff[120]; |
| 2999 | int desc = 0; |
| 3000 | |
| 3001 | if (is_Ht(tbl->lq_type)) |
| 3002 | desc += sprintf(buff+desc, |
| 3003 | "Bit Rate= %d Mb/s\n", |
| 3004 | tbl->expected_tpt[lq_sta->last_txrate_idx]); |
| 3005 | else |
| 3006 | desc += sprintf(buff+desc, |
| 3007 | "Bit Rate= %d Mb/s\n", |
| 3008 | iwl_rates[lq_sta->last_txrate_idx].ieee >> 1); |
| 3009 | |
| 3010 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
| 3011 | } |
| 3012 | |
| 3013 | static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = { |
| 3014 | .read = rs_sta_dbgfs_rate_scale_data_read, |
| 3015 | .open = simple_open, |
| 3016 | .llseek = default_llseek, |
| 3017 | }; |
| 3018 | |
| 3019 | static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir) |
| 3020 | { |
| 3021 | struct iwl_lq_sta *lq_sta = mvm_sta; |
| 3022 | lq_sta->rs_sta_dbgfs_scale_table_file = |
| 3023 | debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, |
| 3024 | lq_sta, &rs_sta_dbgfs_scale_table_ops); |
| 3025 | lq_sta->rs_sta_dbgfs_stats_table_file = |
| 3026 | debugfs_create_file("rate_stats_table", S_IRUSR, dir, |
| 3027 | lq_sta, &rs_sta_dbgfs_stats_table_ops); |
| 3028 | lq_sta->rs_sta_dbgfs_rate_scale_data_file = |
| 3029 | debugfs_create_file("rate_scale_data", S_IRUSR, dir, |
| 3030 | lq_sta, &rs_sta_dbgfs_rate_scale_data_ops); |
| 3031 | lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = |
| 3032 | debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, |
| 3033 | &lq_sta->tx_agg_tid_en); |
| 3034 | } |
| 3035 | |
| 3036 | static void rs_remove_debugfs(void *mvm, void *mvm_sta) |
| 3037 | { |
| 3038 | struct iwl_lq_sta *lq_sta = mvm_sta; |
| 3039 | debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); |
| 3040 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); |
| 3041 | debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file); |
| 3042 | debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); |
| 3043 | } |
| 3044 | #endif |
| 3045 | |
| 3046 | /* |
| 3047 | * Initialization of rate scaling information is done by driver after |
| 3048 | * the station is added. Since mac80211 calls this function before a |
| 3049 | * station is added we ignore it. |
| 3050 | */ |
| 3051 | static void rs_rate_init_stub(void *mvm_r, |
| 3052 | struct ieee80211_supported_band *sband, |
| 3053 | struct ieee80211_sta *sta, void *mvm_sta) |
| 3054 | { |
| 3055 | } |
| 3056 | static struct rate_control_ops rs_mvm_ops = { |
| 3057 | .module = NULL, |
| 3058 | .name = RS_NAME, |
| 3059 | .tx_status = rs_tx_status, |
| 3060 | .get_rate = rs_get_rate, |
| 3061 | .rate_init = rs_rate_init_stub, |
| 3062 | .alloc = rs_alloc, |
| 3063 | .free = rs_free, |
| 3064 | .alloc_sta = rs_alloc_sta, |
| 3065 | .free_sta = rs_free_sta, |
| 3066 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 3067 | .add_sta_debugfs = rs_add_debugfs, |
| 3068 | .remove_sta_debugfs = rs_remove_debugfs, |
| 3069 | #endif |
| 3070 | }; |
| 3071 | |
| 3072 | int iwl_mvm_rate_control_register(void) |
| 3073 | { |
| 3074 | return ieee80211_rate_control_register(&rs_mvm_ops); |
| 3075 | } |
| 3076 | |
| 3077 | void iwl_mvm_rate_control_unregister(void) |
| 3078 | { |
| 3079 | ieee80211_rate_control_unregister(&rs_mvm_ops); |
| 3080 | } |