diff options
Diffstat (limited to 'kernel/drivers/net/wireless/iwlwifi/mvm/rs.c')
| -rw-r--r-- | kernel/drivers/net/wireless/iwlwifi/mvm/rs.c | 3771 |
1 files changed, 3771 insertions, 0 deletions
diff --git a/kernel/drivers/net/wireless/iwlwifi/mvm/rs.c b/kernel/drivers/net/wireless/iwlwifi/mvm/rs.c new file mode 100644 index 000000000..33cd68ae7 --- /dev/null +++ b/kernel/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -0,0 +1,3771 @@ +/****************************************************************************** + * + * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. + * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA + * + * The full GNU General Public License is included in this distribution in the + * file called LICENSE. + * + * Contact Information: + * Intel Linux Wireless <ilw@linux.intel.com> + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + *****************************************************************************/ +#include <linux/kernel.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <net/mac80211.h> + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/delay.h> + +#include <linux/workqueue.h> +#include "rs.h" +#include "fw-api.h" +#include "sta.h" +#include "iwl-op-mode.h" +#include "mvm.h" +#include "debugfs.h" + +#define RS_NAME "iwl-mvm-rs" + +#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ + +/* Calculations of success ratio are done in fixed point where 12800 is 100%. + * Use this macro when dealing with thresholds consts set as a percentage + */ +#define RS_PERCENT(x) (128 * x) + +static u8 rs_ht_to_legacy[] = { + [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, + [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, + [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, + [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, + [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, + [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, + [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, + [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, + [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, + [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, +}; + +static const u8 ant_toggle_lookup[] = { + [ANT_NONE] = ANT_NONE, + [ANT_A] = ANT_B, + [ANT_B] = ANT_C, + [ANT_AB] = ANT_BC, + [ANT_C] = ANT_A, + [ANT_AC] = ANT_AB, + [ANT_BC] = ANT_AC, + [ANT_ABC] = ANT_ABC, +}; + +#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ + [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ + IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ + IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ + IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ + IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ + IWL_RATE_##rp##M_INDEX, \ + IWL_RATE_##rn##M_INDEX } + +#define IWL_DECLARE_MCS_RATE(s) \ + [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ + IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ + IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ + IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ + IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ + IWL_RATE_INVM_INDEX, \ + IWL_RATE_INVM_INDEX } + +/* + * Parameter order: + * rate, ht rate, prev rate, next rate + * + * If there isn't a valid next or previous rate then INV is used which + * maps to IWL_RATE_INVALID + * + */ +static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { + IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ + IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ + IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ + IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ + IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ + IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ + IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ + IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ + IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ + IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ + IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ + IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ + IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ + IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ + IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ +}; + +enum rs_action { + RS_ACTION_STAY = 0, + RS_ACTION_DOWNSCALE = -1, + RS_ACTION_UPSCALE = 1, +}; + +enum rs_column_mode { + RS_INVALID = 0, + RS_LEGACY, + RS_SISO, + RS_MIMO2, +}; + +#define MAX_NEXT_COLUMNS 7 +#define MAX_COLUMN_CHECKS 3 + +struct rs_tx_column; + +typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, + const struct rs_tx_column *next_col); + +struct rs_tx_column { + enum rs_column_mode mode; + u8 ant; + bool sgi; + enum rs_column next_columns[MAX_NEXT_COLUMNS]; + allow_column_func_t checks[MAX_COLUMN_CHECKS]; +}; + +static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, + const struct rs_tx_column *next_col) +{ + return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); +} + +static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, + const struct rs_tx_column *next_col) +{ + struct iwl_mvm_sta *mvmsta; + struct iwl_mvm_vif *mvmvif; + + if (!sta->ht_cap.ht_supported) + return false; + + if (sta->smps_mode == IEEE80211_SMPS_STATIC) + return false; + + if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) + return false; + + if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) + return false; + + mvmsta = iwl_mvm_sta_from_mac80211(sta); + mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); + if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p) + return false; + + if (mvm->nvm_data->sku_cap_mimo_disabled) + return false; + + return true; +} + +static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, + const struct rs_tx_column *next_col) +{ + if (!sta->ht_cap.ht_supported) + return false; + + return true; +} + +static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl, + const struct rs_tx_column *next_col) +{ + struct rs_rate *rate = &tbl->rate; + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; + + if (is_ht20(rate) && (ht_cap->cap & + IEEE80211_HT_CAP_SGI_20)) + return true; + if (is_ht40(rate) && (ht_cap->cap & + IEEE80211_HT_CAP_SGI_40)) + return true; + if (is_ht80(rate) && (vht_cap->cap & + IEEE80211_VHT_CAP_SHORT_GI_80)) + return true; + + return false; +} + +static const struct rs_tx_column rs_tx_columns[] = { + [RS_COLUMN_LEGACY_ANT_A] = { + .mode = RS_LEGACY, + .ant = ANT_A, + .next_columns = { + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_SISO_ANT_A, + RS_COLUMN_MIMO2, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_ant_allow, + }, + }, + [RS_COLUMN_LEGACY_ANT_B] = { + .mode = RS_LEGACY, + .ant = ANT_B, + .next_columns = { + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_SISO_ANT_B, + RS_COLUMN_MIMO2, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_ant_allow, + }, + }, + [RS_COLUMN_SISO_ANT_A] = { + .mode = RS_SISO, + .ant = ANT_A, + .next_columns = { + RS_COLUMN_SISO_ANT_B, + RS_COLUMN_MIMO2, + RS_COLUMN_SISO_ANT_A_SGI, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_siso_allow, + rs_ant_allow, + }, + }, + [RS_COLUMN_SISO_ANT_B] = { + .mode = RS_SISO, + .ant = ANT_B, + .next_columns = { + RS_COLUMN_SISO_ANT_A, + RS_COLUMN_MIMO2, + RS_COLUMN_SISO_ANT_B_SGI, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_siso_allow, + rs_ant_allow, + }, + }, + [RS_COLUMN_SISO_ANT_A_SGI] = { + .mode = RS_SISO, + .ant = ANT_A, + .sgi = true, + .next_columns = { + RS_COLUMN_SISO_ANT_B_SGI, + RS_COLUMN_MIMO2_SGI, + RS_COLUMN_SISO_ANT_A, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_siso_allow, + rs_ant_allow, + rs_sgi_allow, + }, + }, + [RS_COLUMN_SISO_ANT_B_SGI] = { + .mode = RS_SISO, + .ant = ANT_B, + .sgi = true, + .next_columns = { + RS_COLUMN_SISO_ANT_A_SGI, + RS_COLUMN_MIMO2_SGI, + RS_COLUMN_SISO_ANT_B, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_siso_allow, + rs_ant_allow, + rs_sgi_allow, + }, + }, + [RS_COLUMN_MIMO2] = { + .mode = RS_MIMO2, + .ant = ANT_AB, + .next_columns = { + RS_COLUMN_SISO_ANT_A, + RS_COLUMN_MIMO2_SGI, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_mimo_allow, + }, + }, + [RS_COLUMN_MIMO2_SGI] = { + .mode = RS_MIMO2, + .ant = ANT_AB, + .sgi = true, + .next_columns = { + RS_COLUMN_SISO_ANT_A_SGI, + RS_COLUMN_MIMO2, + RS_COLUMN_LEGACY_ANT_A, + RS_COLUMN_LEGACY_ANT_B, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + RS_COLUMN_INVALID, + }, + .checks = { + rs_mimo_allow, + rs_sgi_allow, + }, + }, +}; + +static inline u8 rs_extract_rate(u32 rate_n_flags) +{ + /* also works for HT because bits 7:6 are zero there */ + return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); +} + +static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) +{ + int idx = 0; + + if (rate_n_flags & RATE_MCS_HT_MSK) { + idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; + idx += IWL_RATE_MCS_0_INDEX; + + /* skip 9M not supported in HT*/ + if (idx >= IWL_RATE_9M_INDEX) + idx += 1; + if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) + return idx; + } else if (rate_n_flags & RATE_MCS_VHT_MSK) { + idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; + idx += IWL_RATE_MCS_0_INDEX; + + /* skip 9M not supported in VHT*/ + if (idx >= IWL_RATE_9M_INDEX) + idx++; + if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) + return idx; + } else { + /* legacy rate format, search for match in table */ + + u8 legacy_rate = rs_extract_rate(rate_n_flags); + for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) + if (iwl_rates[idx].plcp == legacy_rate) + return idx; + } + + return IWL_RATE_INVALID; +} + +static void rs_rate_scale_perform(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + int tid); +static void rs_fill_lq_cmd(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + const struct rs_rate *initial_rate); +static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); + +/** + * The following tables contain the expected throughput metrics for all rates + * + * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits + * + * where invalid entries are zeros. + * + * CCK rates are only valid in legacy table and will only be used in G + * (2.4 GHz) band. + */ + +static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { + 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 +}; + +/* Expected TpT tables. 4 indexes: + * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI + */ +static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, + {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, + {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, + {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, +}; + +static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, + {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, + {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, + {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, +}; + +static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, + {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, + {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, + {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, +}; + +static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, + {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, + {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, + {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, +}; + +static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, + {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, + {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, + {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, +}; + +static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { + {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, + {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, + {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, + {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, +}; + +/* mbps, mcs */ +static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { + { "1", "BPSK DSSS"}, + { "2", "QPSK DSSS"}, + {"5.5", "BPSK CCK"}, + { "11", "QPSK CCK"}, + { "6", "BPSK 1/2"}, + { "9", "BPSK 1/2"}, + { "12", "QPSK 1/2"}, + { "18", "QPSK 3/4"}, + { "24", "16QAM 1/2"}, + { "36", "16QAM 3/4"}, + { "48", "64QAM 2/3"}, + { "54", "64QAM 3/4"}, + { "60", "64QAM 5/6"}, +}; + +#define MCS_INDEX_PER_STREAM (8) + +static const char *rs_pretty_ant(u8 ant) +{ + static const char * const ant_name[] = { + [ANT_NONE] = "None", + [ANT_A] = "A", + [ANT_B] = "B", + [ANT_AB] = "AB", + [ANT_C] = "C", + [ANT_AC] = "AC", + [ANT_BC] = "BC", + [ANT_ABC] = "ABC", + }; + + if (ant > ANT_ABC) + return "UNKNOWN"; + + return ant_name[ant]; +} + +static const char *rs_pretty_lq_type(enum iwl_table_type type) +{ + static const char * const lq_types[] = { + [LQ_NONE] = "NONE", + [LQ_LEGACY_A] = "LEGACY_A", + [LQ_LEGACY_G] = "LEGACY_G", + [LQ_HT_SISO] = "HT SISO", + [LQ_HT_MIMO2] = "HT MIMO", + [LQ_VHT_SISO] = "VHT SISO", + [LQ_VHT_MIMO2] = "VHT MIMO", + }; + + if (type < LQ_NONE || type >= LQ_MAX) + return "UNKNOWN"; + + return lq_types[type]; +} + +static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, + const char *prefix) +{ + IWL_DEBUG_RATE(mvm, + "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", + prefix, rs_pretty_lq_type(rate->type), + rate->index, rs_pretty_ant(rate->ant), + rate->bw, rate->sgi, rate->ldpc, rate->stbc); +} + +static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) +{ + window->data = 0; + window->success_counter = 0; + window->success_ratio = IWL_INVALID_VALUE; + window->counter = 0; + window->average_tpt = IWL_INVALID_VALUE; +} + +static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, + struct iwl_scale_tbl_info *tbl) +{ + int i; + + IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); + for (i = 0; i < IWL_RATE_COUNT; i++) + rs_rate_scale_clear_window(&tbl->win[i]); + + for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) + rs_rate_scale_clear_window(&tbl->tpc_win[i]); +} + +static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) +{ + return (ant_type & valid_antenna) == ant_type; +} + +static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_data, u8 tid, + struct ieee80211_sta *sta) +{ + int ret = -EAGAIN; + + IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", + sta->addr, tid); + ret = ieee80211_start_tx_ba_session(sta, tid, 5000); + if (ret == -EAGAIN) { + /* + * driver and mac80211 is out of sync + * this might be cause by reloading firmware + * stop the tx ba session here + */ + IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", + tid); + ieee80211_stop_tx_ba_session(sta, tid); + } + return ret; +} + +static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, + struct iwl_lq_sta *lq_data, + struct ieee80211_sta *sta) +{ + if (tid < IWL_MAX_TID_COUNT) + rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); + else + IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", + tid, IWL_MAX_TID_COUNT); +} + +static inline int get_num_of_ant_from_rate(u32 rate_n_flags) +{ + return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + + !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + + !!(rate_n_flags & RATE_MCS_ANT_C_MSK); +} + +/* + * Static function to get the expected throughput from an iwl_scale_tbl_info + * that wraps a NULL pointer check + */ +static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) +{ + if (tbl->expected_tpt) + return tbl->expected_tpt[rs_index]; + return 0; +} + +/** + * rs_collect_tx_data - Update the success/failure sliding window + * + * We keep a sliding window of the last 62 packets transmitted + * at this rate. window->data contains the bitmask of successful + * packets. + */ +static int _rs_collect_tx_data(struct iwl_mvm *mvm, + struct iwl_scale_tbl_info *tbl, + int scale_index, int attempts, int successes, + struct iwl_rate_scale_data *window) +{ + static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); + s32 fail_count, tpt; + + /* Get expected throughput */ + tpt = get_expected_tpt(tbl, scale_index); + + /* + * Keep track of only the latest 62 tx frame attempts in this rate's + * history window; anything older isn't really relevant any more. + * If we have filled up the sliding window, drop the oldest attempt; + * if the oldest attempt (highest bit in bitmap) shows "success", + * subtract "1" from the success counter (this is the main reason + * we keep these bitmaps!). + */ + while (attempts > 0) { + if (window->counter >= IWL_RATE_MAX_WINDOW) { + /* remove earliest */ + window->counter = IWL_RATE_MAX_WINDOW - 1; + + if (window->data & mask) { + window->data &= ~mask; + window->success_counter--; + } + } + + /* Increment frames-attempted counter */ + window->counter++; + + /* Shift bitmap by one frame to throw away oldest history */ + window->data <<= 1; + + /* Mark the most recent #successes attempts as successful */ + if (successes > 0) { + window->success_counter++; + window->data |= 0x1; + successes--; + } + + attempts--; + } + + /* Calculate current success ratio, avoid divide-by-0! */ + if (window->counter > 0) + window->success_ratio = 128 * (100 * window->success_counter) + / window->counter; + else + window->success_ratio = IWL_INVALID_VALUE; + + fail_count = window->counter - window->success_counter; + + /* Calculate average throughput, if we have enough history. */ + if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || + (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) + window->average_tpt = (window->success_ratio * tpt + 64) / 128; + else + window->average_tpt = IWL_INVALID_VALUE; + + return 0; +} + +static int rs_collect_tx_data(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, + int scale_index, int attempts, int successes, + u8 reduced_txp) +{ + struct iwl_rate_scale_data *window = NULL; + int ret; + + if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) + return -EINVAL; + + if (tbl->column != RS_COLUMN_INVALID) { + struct lq_sta_pers *pers = &lq_sta->pers; + + pers->tx_stats[tbl->column][scale_index].total += attempts; + pers->tx_stats[tbl->column][scale_index].success += successes; + } + + /* Select window for current tx bit rate */ + window = &(tbl->win[scale_index]); + + ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, + window); + if (ret) + return ret; + + if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) + return -EINVAL; + + window = &tbl->tpc_win[reduced_txp]; + return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, + window); +} + +/* Convert rs_rate object into ucode rate bitmask */ +static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, + struct rs_rate *rate) +{ + u32 ucode_rate = 0; + int index = rate->index; + + ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & + RATE_MCS_ANT_ABC_MSK); + + if (is_legacy(rate)) { + ucode_rate |= iwl_rates[index].plcp; + if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) + ucode_rate |= RATE_MCS_CCK_MSK; + return ucode_rate; + } + + if (is_ht(rate)) { + if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { + IWL_ERR(mvm, "Invalid HT rate index %d\n", index); + index = IWL_LAST_HT_RATE; + } + ucode_rate |= RATE_MCS_HT_MSK; + + if (is_ht_siso(rate)) + ucode_rate |= iwl_rates[index].plcp_ht_siso; + else if (is_ht_mimo2(rate)) + ucode_rate |= iwl_rates[index].plcp_ht_mimo2; + else + WARN_ON_ONCE(1); + } else if (is_vht(rate)) { + if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { + IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); + index = IWL_LAST_VHT_RATE; + } + ucode_rate |= RATE_MCS_VHT_MSK; + if (is_vht_siso(rate)) + ucode_rate |= iwl_rates[index].plcp_vht_siso; + else if (is_vht_mimo2(rate)) + ucode_rate |= iwl_rates[index].plcp_vht_mimo2; + else + WARN_ON_ONCE(1); + + } else { + IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); + } + + if (is_siso(rate) && rate->stbc) { + /* To enable STBC we need to set both a flag and ANT_AB */ + ucode_rate |= RATE_MCS_ANT_AB_MSK; + ucode_rate |= RATE_MCS_VHT_STBC_MSK; + } + + ucode_rate |= rate->bw; + if (rate->sgi) + ucode_rate |= RATE_MCS_SGI_MSK; + if (rate->ldpc) + ucode_rate |= RATE_MCS_LDPC_MSK; + + return ucode_rate; +} + +/* Convert a ucode rate into an rs_rate object */ +static int rs_rate_from_ucode_rate(const u32 ucode_rate, + enum ieee80211_band band, + struct rs_rate *rate) +{ + u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; + u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); + u8 nss; + + memset(rate, 0, sizeof(*rate)); + rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); + + if (rate->index == IWL_RATE_INVALID) + return -EINVAL; + + rate->ant = (ant_msk >> RATE_MCS_ANT_POS); + + /* Legacy */ + if (!(ucode_rate & RATE_MCS_HT_MSK) && + !(ucode_rate & RATE_MCS_VHT_MSK)) { + if (num_of_ant == 1) { + if (band == IEEE80211_BAND_5GHZ) + rate->type = LQ_LEGACY_A; + else + rate->type = LQ_LEGACY_G; + } + + return 0; + } + + /* HT or VHT */ + if (ucode_rate & RATE_MCS_SGI_MSK) + rate->sgi = true; + if (ucode_rate & RATE_MCS_LDPC_MSK) + rate->ldpc = true; + if (ucode_rate & RATE_MCS_VHT_STBC_MSK) + rate->stbc = true; + if (ucode_rate & RATE_MCS_BF_MSK) + rate->bfer = true; + + rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; + + if (ucode_rate & RATE_MCS_HT_MSK) { + nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> + RATE_HT_MCS_NSS_POS) + 1; + + if (nss == 1) { + rate->type = LQ_HT_SISO; + WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, + "stbc %d bfer %d", + rate->stbc, rate->bfer); + } else if (nss == 2) { + rate->type = LQ_HT_MIMO2; + WARN_ON_ONCE(num_of_ant != 2); + } else { + WARN_ON_ONCE(1); + } + } else if (ucode_rate & RATE_MCS_VHT_MSK) { + nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> + RATE_VHT_MCS_NSS_POS) + 1; + + if (nss == 1) { + rate->type = LQ_VHT_SISO; + WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, + "stbc %d bfer %d", + rate->stbc, rate->bfer); + } else if (nss == 2) { + rate->type = LQ_VHT_MIMO2; + WARN_ON_ONCE(num_of_ant != 2); + } else { + WARN_ON_ONCE(1); + } + } + + WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); + WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && + !is_vht(rate)); + + return 0; +} + +/* switch to another antenna/antennas and return 1 */ +/* if no other valid antenna found, return 0 */ +static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) +{ + u8 new_ant_type; + + if (!rate->ant || rate->ant > ANT_ABC) + return 0; + + if (!rs_is_valid_ant(valid_ant, rate->ant)) + return 0; + + new_ant_type = ant_toggle_lookup[rate->ant]; + + while ((new_ant_type != rate->ant) && + !rs_is_valid_ant(valid_ant, new_ant_type)) + new_ant_type = ant_toggle_lookup[new_ant_type]; + + if (new_ant_type == rate->ant) + return 0; + + rate->ant = new_ant_type; + + return 1; +} + +static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, + struct rs_rate *rate) +{ + if (is_legacy(rate)) + return lq_sta->active_legacy_rate; + else if (is_siso(rate)) + return lq_sta->active_siso_rate; + else if (is_mimo2(rate)) + return lq_sta->active_mimo2_rate; + + WARN_ON_ONCE(1); + return 0; +} + +static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, + int rate_type) +{ + u8 high = IWL_RATE_INVALID; + u8 low = IWL_RATE_INVALID; + + /* 802.11A or ht walks to the next literal adjacent rate in + * the rate table */ + if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { + int i; + u32 mask; + + /* Find the previous rate that is in the rate mask */ + i = index - 1; + for (mask = (1 << i); i >= 0; i--, mask >>= 1) { + if (rate_mask & mask) { + low = i; + break; + } + } + + /* Find the next rate that is in the rate mask */ + i = index + 1; + for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { + if (rate_mask & mask) { + high = i; + break; + } + } + + return (high << 8) | low; + } + + low = index; + while (low != IWL_RATE_INVALID) { + low = iwl_rates[low].prev_rs; + if (low == IWL_RATE_INVALID) + break; + if (rate_mask & (1 << low)) + break; + } + + high = index; + while (high != IWL_RATE_INVALID) { + high = iwl_rates[high].next_rs; + if (high == IWL_RATE_INVALID) + break; + if (rate_mask & (1 << high)) + break; + } + + return (high << 8) | low; +} + +static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, + struct rs_rate *rate) +{ + return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); +} + +/* Get the next supported lower rate in the current column. + * Return true if bottom rate in the current column was reached + */ +static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, + struct rs_rate *rate) +{ + u8 low; + u16 high_low; + u16 rate_mask; + struct iwl_mvm *mvm = lq_sta->pers.drv; + + rate_mask = rs_get_supported_rates(lq_sta, rate); + high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, + rate->type); + low = high_low & 0xff; + + /* Bottom rate of column reached */ + if (low == IWL_RATE_INVALID) + return true; + + rate->index = low; + return false; +} + +/* Get the next rate to use following a column downgrade */ +static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, + struct rs_rate *rate) +{ + struct iwl_mvm *mvm = lq_sta->pers.drv; + + if (is_legacy(rate)) { + /* No column to downgrade from Legacy */ + return; + } else if (is_siso(rate)) { + /* Downgrade to Legacy if we were in SISO */ + if (lq_sta->band == IEEE80211_BAND_5GHZ) + rate->type = LQ_LEGACY_A; + else + rate->type = LQ_LEGACY_G; + + rate->bw = RATE_MCS_CHAN_WIDTH_20; + + WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || + rate->index > IWL_RATE_MCS_9_INDEX); + + rate->index = rs_ht_to_legacy[rate->index]; + rate->ldpc = false; + } else { + /* Downgrade to SISO with same MCS if in MIMO */ + rate->type = is_vht_mimo2(rate) ? + LQ_VHT_SISO : LQ_HT_SISO; + } + + if (num_of_ant(rate->ant) > 1) + rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); + + /* Relevant in both switching to SISO or Legacy */ + rate->sgi = false; + + if (!rs_rate_supported(lq_sta, rate)) + rs_get_lower_rate_in_column(lq_sta, rate); +} + +/* Check if both rates are identical + * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B + * with a rate indicating STBC/BFER and ANT_AB. + */ +static inline bool rs_rate_equal(struct rs_rate *a, + struct rs_rate *b, + bool allow_ant_mismatch) + +{ + bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && + (a->bfer == b->bfer); + + if (allow_ant_mismatch) { + if (a->stbc || a->bfer) { + WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", + a->stbc, a->bfer, a->ant); + ant_match |= (b->ant == ANT_A || b->ant == ANT_B); + } else if (b->stbc || b->bfer) { + WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", + b->stbc, b->bfer, b->ant); + ant_match |= (a->ant == ANT_A || a->ant == ANT_B); + } + } + + return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && + (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; +} + +/* Check if both rates share the same column */ +static inline bool rs_rate_column_match(struct rs_rate *a, + struct rs_rate *b) +{ + bool ant_match; + + if (a->stbc || a->bfer) + ant_match = (b->ant == ANT_A || b->ant == ANT_B); + else + ant_match = (a->ant == b->ant); + + return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) + && ant_match; +} + +static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) +{ + if (is_legacy(rate)) { + if (rate->ant == ANT_A) + return RS_COLUMN_LEGACY_ANT_A; + + if (rate->ant == ANT_B) + return RS_COLUMN_LEGACY_ANT_B; + + goto err; + } + + if (is_siso(rate)) { + if (rate->ant == ANT_A || rate->stbc || rate->bfer) + return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : + RS_COLUMN_SISO_ANT_A; + + if (rate->ant == ANT_B) + return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : + RS_COLUMN_SISO_ANT_B; + + goto err; + } + + if (is_mimo(rate)) + return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; + +err: + return RS_COLUMN_INVALID; +} + +static u8 rs_get_tid(struct ieee80211_hdr *hdr) +{ + u8 tid = IWL_MAX_TID_COUNT; + + if (ieee80211_is_data_qos(hdr->frame_control)) { + u8 *qc = ieee80211_get_qos_ctl(hdr); + tid = qc[0] & 0xf; + } + + if (unlikely(tid > IWL_MAX_TID_COUNT)) + tid = IWL_MAX_TID_COUNT; + + return tid; +} + +void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + int tid, struct ieee80211_tx_info *info) +{ + int legacy_success; + int retries; + int i; + struct iwl_lq_cmd *table; + u32 lq_hwrate; + struct rs_rate lq_rate, tx_resp_rate; + struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; + u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; + u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; + struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); + struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; + bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] & + IWL_UCODE_TLV_API_LQ_SS_PARAMS; + + /* Treat uninitialized rate scaling data same as non-existing. */ + if (!lq_sta) { + IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); + return; + } else if (!lq_sta->pers.drv) { + IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); + return; + } + + /* This packet was aggregated but doesn't carry status info */ + if ((info->flags & IEEE80211_TX_CTL_AMPDU) && + !(info->flags & IEEE80211_TX_STAT_AMPDU)) + return; + + rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); + +#ifdef CONFIG_MAC80211_DEBUGFS + /* Disable last tx check if we are debugging with fixed rate but + * update tx stats */ + if (lq_sta->pers.dbg_fixed_rate) { + int index = tx_resp_rate.index; + enum rs_column column; + int attempts, success; + + column = rs_get_column_from_rate(&tx_resp_rate); + if (WARN_ONCE(column == RS_COLUMN_INVALID, + "Can't map rate 0x%x to column", + tx_resp_hwrate)) + return; + + if (info->flags & IEEE80211_TX_STAT_AMPDU) { + attempts = info->status.ampdu_len; + success = info->status.ampdu_ack_len; + } else { + attempts = info->status.rates[0].count; + success = !!(info->flags & IEEE80211_TX_STAT_ACK); + } + + lq_sta->pers.tx_stats[column][index].total += attempts; + lq_sta->pers.tx_stats[column][index].success += success; + + IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", + tx_resp_hwrate, success, attempts); + return; + } +#endif + + if (time_after(jiffies, + (unsigned long)(lq_sta->last_tx + + (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { + int t; + + IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); + for (t = 0; t < IWL_MAX_TID_COUNT; t++) + ieee80211_stop_tx_ba_session(sta, t); + + iwl_mvm_rs_rate_init(mvm, sta, info->band, false); + return; + } + lq_sta->last_tx = jiffies; + + /* Ignore this Tx frame response if its initial rate doesn't match + * that of latest Link Quality command. There may be stragglers + * from a previous Link Quality command, but we're no longer interested + * in those; they're either from the "active" mode while we're trying + * to check "search" mode, or a prior "search" mode after we've moved + * to a new "search" mode (which might become the new "active" mode). + */ + table = &lq_sta->lq; + lq_hwrate = le32_to_cpu(table->rs_table[0]); + rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); + + /* Here we actually compare this rate to the latest LQ command */ + if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { + IWL_DEBUG_RATE(mvm, + "initial tx resp rate 0x%x does not match 0x%x\n", + tx_resp_hwrate, lq_hwrate); + + /* + * Since rates mis-match, the last LQ command may have failed. + * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with + * ... driver. + */ + lq_sta->missed_rate_counter++; + if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { + lq_sta->missed_rate_counter = 0; + IWL_DEBUG_RATE(mvm, + "Too many rates mismatch. Send sync LQ. rs_state %d\n", + lq_sta->rs_state); + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); + } + /* Regardless, ignore this status info for outdated rate */ + return; + } else + /* Rate did match, so reset the missed_rate_counter */ + lq_sta->missed_rate_counter = 0; + + if (!lq_sta->search_better_tbl) { + curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + } else { + curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + } + + if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { + IWL_DEBUG_RATE(mvm, + "Neither active nor search matches tx rate\n"); + tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); + tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); + rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); + rs_dump_rate(mvm, &lq_rate, "ACTUAL"); + + /* + * no matching table found, let's by-pass the data collection + * and continue to perform rate scale to find the rate table + */ + rs_stay_in_table(lq_sta, true); + goto done; + } + + /* + * Updating the frame history depends on whether packets were + * aggregated. + * + * For aggregation, all packets were transmitted at the same rate, the + * first index into rate scale table. + */ + if (info->flags & IEEE80211_TX_STAT_AMPDU) { + /* ampdu_ack_len = 0 marks no BA was received. In this case + * treat it as a single frame loss as we don't want the success + * ratio to dip too quickly because a BA wasn't received + */ + if (info->status.ampdu_ack_len == 0) + info->status.ampdu_len = 1; + + rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index, + info->status.ampdu_len, + info->status.ampdu_ack_len, + reduced_txp); + + /* Update success/fail counts if not searching for new mode */ + if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { + lq_sta->total_success += info->status.ampdu_ack_len; + lq_sta->total_failed += (info->status.ampdu_len - + info->status.ampdu_ack_len); + } + } else { + /* For legacy, update frame history with for each Tx retry. */ + retries = info->status.rates[0].count - 1; + /* HW doesn't send more than 15 retries */ + retries = min(retries, 15); + + /* The last transmission may have been successful */ + legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); + /* Collect data for each rate used during failed TX attempts */ + for (i = 0; i <= retries; ++i) { + lq_hwrate = le32_to_cpu(table->rs_table[i]); + rs_rate_from_ucode_rate(lq_hwrate, info->band, + &lq_rate); + /* + * Only collect stats if retried rate is in the same RS + * table as active/search. + */ + if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) + tmp_tbl = curr_tbl; + else if (rs_rate_column_match(&lq_rate, + &other_tbl->rate)) + tmp_tbl = other_tbl; + else + continue; + + rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index, + 1, i < retries ? 0 : legacy_success, + reduced_txp); + } + + /* Update success/fail counts if not searching for new mode */ + if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { + lq_sta->total_success += legacy_success; + lq_sta->total_failed += retries + (1 - legacy_success); + } + } + /* The last TX rate is cached in lq_sta; it's set in if/else above */ + lq_sta->last_rate_n_flags = lq_hwrate; + IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); +done: + /* See if there's a better rate or modulation mode to try. */ + if (sta->supp_rates[info->band]) + rs_rate_scale_perform(mvm, sta, lq_sta, tid); +} + +/* + * mac80211 sends us Tx status + */ +static void rs_mac80211_tx_status(void *mvm_r, + struct ieee80211_supported_band *sband, + struct ieee80211_sta *sta, void *priv_sta, + struct sk_buff *skb) +{ + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; + struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + + if (!iwl_mvm_sta_from_mac80211(sta)->vif) + return; + + if (!ieee80211_is_data(hdr->frame_control) || + info->flags & IEEE80211_TX_CTL_NO_ACK) + return; + + iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info); +} + +/* + * Begin a period of staying with a selected modulation mode. + * Set "stay_in_tbl" flag to prevent any mode switches. + * Set frame tx success limits according to legacy vs. high-throughput, + * and reset overall (spanning all rates) tx success history statistics. + * These control how long we stay using same modulation mode before + * searching for a new mode. + */ +static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, + struct iwl_lq_sta *lq_sta) +{ + IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); + lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; + if (is_legacy) { + lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; + lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; + lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; + } else { + lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; + lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; + lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; + } + lq_sta->table_count = 0; + lq_sta->total_failed = 0; + lq_sta->total_success = 0; + lq_sta->flush_timer = jiffies; + lq_sta->visited_columns = 0; +} + +static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) +{ + if (rate_mask) + return find_last_bit(&rate_mask, BITS_PER_LONG); + return IWL_RATE_INVALID; +} + +static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, + const struct rs_tx_column *column) +{ + switch (column->mode) { + case RS_LEGACY: + return lq_sta->max_legacy_rate_idx; + case RS_SISO: + return lq_sta->max_siso_rate_idx; + case RS_MIMO2: + return lq_sta->max_mimo2_rate_idx; + default: + WARN_ON_ONCE(1); + } + + return lq_sta->max_legacy_rate_idx; +} + +static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, + const struct rs_tx_column *column, + u32 bw) +{ + /* Used to choose among HT tables */ + const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; + + if (WARN_ON_ONCE(column->mode != RS_LEGACY && + column->mode != RS_SISO && + column->mode != RS_MIMO2)) + return expected_tpt_legacy; + + /* Legacy rates have only one table */ + if (column->mode == RS_LEGACY) + return expected_tpt_legacy; + + ht_tbl_pointer = expected_tpt_mimo2_20MHz; + /* Choose among many HT tables depending on number of streams + * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation + * status */ + if (column->mode == RS_SISO) { + switch (bw) { + case RATE_MCS_CHAN_WIDTH_20: + ht_tbl_pointer = expected_tpt_siso_20MHz; + break; + case RATE_MCS_CHAN_WIDTH_40: + ht_tbl_pointer = expected_tpt_siso_40MHz; + break; + case RATE_MCS_CHAN_WIDTH_80: + ht_tbl_pointer = expected_tpt_siso_80MHz; + break; + default: + WARN_ON_ONCE(1); + } + } else if (column->mode == RS_MIMO2) { + switch (bw) { + case RATE_MCS_CHAN_WIDTH_20: + ht_tbl_pointer = expected_tpt_mimo2_20MHz; + break; + case RATE_MCS_CHAN_WIDTH_40: + ht_tbl_pointer = expected_tpt_mimo2_40MHz; + break; + case RATE_MCS_CHAN_WIDTH_80: + ht_tbl_pointer = expected_tpt_mimo2_80MHz; + break; + default: + WARN_ON_ONCE(1); + } + } else { + WARN_ON_ONCE(1); + } + + if (!column->sgi && !lq_sta->is_agg) /* Normal */ + return ht_tbl_pointer[0]; + else if (column->sgi && !lq_sta->is_agg) /* SGI */ + return ht_tbl_pointer[1]; + else if (!column->sgi && lq_sta->is_agg) /* AGG */ + return ht_tbl_pointer[2]; + else /* AGG+SGI */ + return ht_tbl_pointer[3]; +} + +static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl) +{ + struct rs_rate *rate = &tbl->rate; + const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; + + tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); +} + +static s32 rs_get_best_rate(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl, /* "search" */ + unsigned long rate_mask, s8 index) +{ + struct iwl_scale_tbl_info *active_tbl = + &(lq_sta->lq_info[lq_sta->active_tbl]); + s32 success_ratio = active_tbl->win[index].success_ratio; + u16 expected_current_tpt = active_tbl->expected_tpt[index]; + const u16 *tpt_tbl = tbl->expected_tpt; + u16 high_low; + u32 target_tpt; + int rate_idx; + + if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) { + target_tpt = 100 * expected_current_tpt; + IWL_DEBUG_RATE(mvm, + "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", + success_ratio, target_tpt); + } else { + target_tpt = lq_sta->last_tpt; + IWL_DEBUG_RATE(mvm, + "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n", + success_ratio, target_tpt); + } + + rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); + + while (rate_idx != IWL_RATE_INVALID) { + if (target_tpt < (100 * tpt_tbl[rate_idx])) + break; + + high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, + tbl->rate.type); + + rate_idx = (high_low >> 8) & 0xff; + } + + IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", + rate_idx, target_tpt, + rate_idx != IWL_RATE_INVALID ? + 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); + + return rate_idx; +} + +static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) +{ + if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) + return RATE_MCS_CHAN_WIDTH_80; + else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) + return RATE_MCS_CHAN_WIDTH_40; + + return RATE_MCS_CHAN_WIDTH_20; +} + +/* + * Check whether we should continue using same modulation mode, or + * begin search for a new mode, based on: + * 1) # tx successes or failures while using this mode + * 2) # times calling this function + * 3) elapsed time in this mode (not used, for now) + */ +static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) +{ + struct iwl_scale_tbl_info *tbl; + int active_tbl; + int flush_interval_passed = 0; + struct iwl_mvm *mvm; + + mvm = lq_sta->pers.drv; + active_tbl = lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + + /* If we've been disallowing search, see if we should now allow it */ + if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { + /* Elapsed time using current modulation mode */ + if (lq_sta->flush_timer) + flush_interval_passed = + time_after(jiffies, + (unsigned long)(lq_sta->flush_timer + + (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); + + /* + * Check if we should allow search for new modulation mode. + * If many frames have failed or succeeded, or we've used + * this same modulation for a long time, allow search, and + * reset history stats that keep track of whether we should + * allow a new search. Also (below) reset all bitmaps and + * stats in active history. + */ + if (force_search || + (lq_sta->total_failed > lq_sta->max_failure_limit) || + (lq_sta->total_success > lq_sta->max_success_limit) || + ((!lq_sta->search_better_tbl) && + (lq_sta->flush_timer) && (flush_interval_passed))) { + IWL_DEBUG_RATE(mvm, + "LQ: stay is expired %d %d %d\n", + lq_sta->total_failed, + lq_sta->total_success, + flush_interval_passed); + + /* Allow search for new mode */ + lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; + IWL_DEBUG_RATE(mvm, + "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); + lq_sta->total_failed = 0; + lq_sta->total_success = 0; + lq_sta->flush_timer = 0; + /* mark the current column as visited */ + lq_sta->visited_columns = BIT(tbl->column); + /* + * Else if we've used this modulation mode enough repetitions + * (regardless of elapsed time or success/failure), reset + * history bitmaps and rate-specific stats for all rates in + * active table. + */ + } else { + lq_sta->table_count++; + if (lq_sta->table_count >= + lq_sta->table_count_limit) { + lq_sta->table_count = 0; + + IWL_DEBUG_RATE(mvm, + "LQ: stay in table clear win\n"); + rs_rate_scale_clear_tbl_windows(mvm, tbl); + } + } + + /* If transitioning to allow "search", reset all history + * bitmaps and stats in active table (this will become the new + * "search" table). */ + if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { + rs_rate_scale_clear_tbl_windows(mvm, tbl); + } + } +} + +/* + * setup rate table in uCode + */ +static void rs_update_rate_tbl(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl) +{ + rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); +} + +static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *sta, + struct iwl_scale_tbl_info *tbl) +{ + int i, j, max_rate; + enum rs_column next_col_id; + const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; + const struct rs_tx_column *next_col; + allow_column_func_t allow_func; + u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); + const u16 *expected_tpt_tbl; + u16 tpt, max_expected_tpt; + + for (i = 0; i < MAX_NEXT_COLUMNS; i++) { + next_col_id = curr_col->next_columns[i]; + + if (next_col_id == RS_COLUMN_INVALID) + continue; + + if (lq_sta->visited_columns & BIT(next_col_id)) { + IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", + next_col_id); + continue; + } + + next_col = &rs_tx_columns[next_col_id]; + + if (!rs_is_valid_ant(valid_ants, next_col->ant)) { + IWL_DEBUG_RATE(mvm, + "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", + next_col_id, valid_ants, next_col->ant); + continue; + } + + for (j = 0; j < MAX_COLUMN_CHECKS; j++) { + allow_func = next_col->checks[j]; + if (allow_func && !allow_func(mvm, sta, tbl, next_col)) + break; + } + + if (j != MAX_COLUMN_CHECKS) { + IWL_DEBUG_RATE(mvm, + "Skip column %d: not allowed (check %d failed)\n", + next_col_id, j); + + continue; + } + + tpt = lq_sta->last_tpt / 100; + expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, + rs_bw_from_sta_bw(sta)); + if (WARN_ON_ONCE(!expected_tpt_tbl)) + continue; + + max_rate = rs_get_max_allowed_rate(lq_sta, next_col); + if (max_rate == IWL_RATE_INVALID) { + IWL_DEBUG_RATE(mvm, + "Skip column %d: no rate is allowed in this column\n", + next_col_id); + continue; + } + + max_expected_tpt = expected_tpt_tbl[max_rate]; + if (tpt >= max_expected_tpt) { + IWL_DEBUG_RATE(mvm, + "Skip column %d: can't beat current TPT. Max expected %d current %d\n", + next_col_id, max_expected_tpt, tpt); + continue; + } + + IWL_DEBUG_RATE(mvm, + "Found potential column %d. Max expected %d current %d\n", + next_col_id, max_expected_tpt, tpt); + break; + } + + if (i == MAX_NEXT_COLUMNS) + return RS_COLUMN_INVALID; + + return next_col_id; +} + +static int rs_switch_to_column(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta *sta, + enum rs_column col_id) +{ + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + struct iwl_scale_tbl_info *search_tbl = + &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + struct rs_rate *rate = &search_tbl->rate; + const struct rs_tx_column *column = &rs_tx_columns[col_id]; + const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; + u32 sz = (sizeof(struct iwl_scale_tbl_info) - + (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); + unsigned long rate_mask = 0; + u32 rate_idx = 0; + + memcpy(search_tbl, tbl, sz); + + rate->sgi = column->sgi; + rate->ant = column->ant; + + if (column->mode == RS_LEGACY) { + if (lq_sta->band == IEEE80211_BAND_5GHZ) + rate->type = LQ_LEGACY_A; + else + rate->type = LQ_LEGACY_G; + + rate->bw = RATE_MCS_CHAN_WIDTH_20; + rate->ldpc = false; + rate_mask = lq_sta->active_legacy_rate; + } else if (column->mode == RS_SISO) { + rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; + rate_mask = lq_sta->active_siso_rate; + } else if (column->mode == RS_MIMO2) { + rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; + rate_mask = lq_sta->active_mimo2_rate; + } else { + WARN_ON_ONCE("Bad column mode"); + } + + if (column->mode != RS_LEGACY) { + rate->bw = rs_bw_from_sta_bw(sta); + rate->ldpc = lq_sta->ldpc; + } + + search_tbl->column = col_id; + rs_set_expected_tpt_table(lq_sta, search_tbl); + + lq_sta->visited_columns |= BIT(col_id); + + /* Get the best matching rate if we're changing modes. e.g. + * SISO->MIMO, LEGACY->SISO, MIMO->SISO + */ + if (curr_column->mode != column->mode) { + rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, + rate_mask, rate->index); + + if ((rate_idx == IWL_RATE_INVALID) || + !(BIT(rate_idx) & rate_mask)) { + IWL_DEBUG_RATE(mvm, + "can not switch with index %d" + " rate mask %lx\n", + rate_idx, rate_mask); + + goto err; + } + + rate->index = rate_idx; + } + + IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", + col_id, rate->index); + + return 0; + +err: + rate->type = LQ_NONE; + return -1; +} + +static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, + struct iwl_scale_tbl_info *tbl, + s32 sr, int low, int high, + int current_tpt, + int low_tpt, int high_tpt) +{ + enum rs_action action = RS_ACTION_STAY; + + if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || + (current_tpt == 0)) { + IWL_DEBUG_RATE(mvm, + "Decrease rate because of low SR\n"); + return RS_ACTION_DOWNSCALE; + } + + if ((low_tpt == IWL_INVALID_VALUE) && + (high_tpt == IWL_INVALID_VALUE) && + (high != IWL_RATE_INVALID)) { + IWL_DEBUG_RATE(mvm, + "No data about high/low rates. Increase rate\n"); + return RS_ACTION_UPSCALE; + } + + if ((high_tpt == IWL_INVALID_VALUE) && + (high != IWL_RATE_INVALID) && + (low_tpt != IWL_INVALID_VALUE) && + (low_tpt < current_tpt)) { + IWL_DEBUG_RATE(mvm, + "No data about high rate and low rate is worse. Increase rate\n"); + return RS_ACTION_UPSCALE; + } + + if ((high_tpt != IWL_INVALID_VALUE) && + (high_tpt > current_tpt)) { + IWL_DEBUG_RATE(mvm, + "Higher rate is better. Increate rate\n"); + return RS_ACTION_UPSCALE; + } + + if ((low_tpt != IWL_INVALID_VALUE) && + (high_tpt != IWL_INVALID_VALUE) && + (low_tpt < current_tpt) && + (high_tpt < current_tpt)) { + IWL_DEBUG_RATE(mvm, + "Both high and low are worse. Maintain rate\n"); + return RS_ACTION_STAY; + } + + if ((low_tpt != IWL_INVALID_VALUE) && + (low_tpt > current_tpt)) { + IWL_DEBUG_RATE(mvm, + "Lower rate is better\n"); + action = RS_ACTION_DOWNSCALE; + goto out; + } + + if ((low_tpt == IWL_INVALID_VALUE) && + (low != IWL_RATE_INVALID)) { + IWL_DEBUG_RATE(mvm, + "No data about lower rate\n"); + action = RS_ACTION_DOWNSCALE; + goto out; + } + + IWL_DEBUG_RATE(mvm, "Maintain rate\n"); + +out: + if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { + if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { + IWL_DEBUG_RATE(mvm, + "SR is above NO DECREASE. Avoid downscale\n"); + action = RS_ACTION_STAY; + } else if (current_tpt > (100 * tbl->expected_tpt[low])) { + IWL_DEBUG_RATE(mvm, + "Current TPT is higher than max expected in low rate. Avoid downscale\n"); + action = RS_ACTION_STAY; + } else { + IWL_DEBUG_RATE(mvm, "Decrease rate\n"); + } + } + + return action; +} + +static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta) +{ + /* Our chip supports Tx STBC and the peer is an HT/VHT STA which + * supports STBC of at least 1*SS + */ + if (!lq_sta->stbc_capable) + return false; + + if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) + return false; + + return true; +} + +static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, + int *weaker, int *stronger) +{ + *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; + if (*weaker > TPC_MAX_REDUCTION) + *weaker = TPC_INVALID; + + *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; + if (*stronger < 0) + *stronger = TPC_INVALID; +} + +static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, + struct rs_rate *rate, enum ieee80211_band band) +{ + int index = rate->index; + bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); + bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && + !vif->bss_conf.ps); + + IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", + cam, sta_ps_disabled); + /* + * allow tpc only if power management is enabled, or bt coex + * activity grade allows it and we are on 2.4Ghz. + */ + if ((cam || sta_ps_disabled) && + !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) + return false; + + IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); + if (is_legacy(rate)) + return index == IWL_RATE_54M_INDEX; + if (is_ht(rate)) + return index == IWL_RATE_MCS_7_INDEX; + if (is_vht(rate)) + return index == IWL_RATE_MCS_7_INDEX || + index == IWL_RATE_MCS_8_INDEX || + index == IWL_RATE_MCS_9_INDEX; + + WARN_ON_ONCE(1); + return false; +} + +enum tpc_action { + TPC_ACTION_STAY, + TPC_ACTION_DECREASE, + TPC_ACTION_INCREASE, + TPC_ACTION_NO_RESTIRCTION, +}; + +static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, + s32 sr, int weak, int strong, + int current_tpt, + int weak_tpt, int strong_tpt) +{ + /* stay until we have valid tpt */ + if (current_tpt == IWL_INVALID_VALUE) { + IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); + return TPC_ACTION_STAY; + } + + /* Too many failures, increase txp */ + if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || + current_tpt == 0) { + IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); + return TPC_ACTION_NO_RESTIRCTION; + } + + /* try decreasing first if applicable */ + if (weak != TPC_INVALID) { + if (weak_tpt == IWL_INVALID_VALUE && + (strong_tpt == IWL_INVALID_VALUE || + current_tpt >= strong_tpt)) { + IWL_DEBUG_RATE(mvm, + "no weak txp measurement. decrease txp\n"); + return TPC_ACTION_DECREASE; + } + + if (weak_tpt > current_tpt) { + IWL_DEBUG_RATE(mvm, + "lower txp has better tpt. decrease txp\n"); + return TPC_ACTION_DECREASE; + } + } + + /* next, increase if needed */ + if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && + strong != TPC_INVALID) { + if (weak_tpt == IWL_INVALID_VALUE && + strong_tpt != IWL_INVALID_VALUE && + current_tpt < strong_tpt) { + IWL_DEBUG_RATE(mvm, + "higher txp has better tpt. increase txp\n"); + return TPC_ACTION_INCREASE; + } + + if (weak_tpt < current_tpt && + (strong_tpt == IWL_INVALID_VALUE || + strong_tpt > current_tpt)) { + IWL_DEBUG_RATE(mvm, + "lower txp has worse tpt. increase txp\n"); + return TPC_ACTION_INCREASE; + } + } + + IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); + return TPC_ACTION_STAY; +} + +static bool rs_tpc_perform(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + struct iwl_scale_tbl_info *tbl) +{ + struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); + struct ieee80211_vif *vif = mvm_sta->vif; + struct ieee80211_chanctx_conf *chanctx_conf; + enum ieee80211_band band; + struct iwl_rate_scale_data *window; + struct rs_rate *rate = &tbl->rate; + enum tpc_action action; + s32 sr; + u8 cur = lq_sta->lq.reduced_tpc; + int current_tpt; + int weak, strong; + int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; + +#ifdef CONFIG_MAC80211_DEBUGFS + if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { + IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", + lq_sta->pers.dbg_fixed_txp_reduction); + lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; + return cur != lq_sta->pers.dbg_fixed_txp_reduction; + } +#endif + + rcu_read_lock(); + chanctx_conf = rcu_dereference(vif->chanctx_conf); + if (WARN_ON(!chanctx_conf)) + band = IEEE80211_NUM_BANDS; + else + band = chanctx_conf->def.chan->band; + rcu_read_unlock(); + + if (!rs_tpc_allowed(mvm, vif, rate, band)) { + IWL_DEBUG_RATE(mvm, + "tpc is not allowed. remove txp restrictions\n"); + lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; + return cur != TPC_NO_REDUCTION; + } + + rs_get_adjacent_txp(mvm, cur, &weak, &strong); + + /* Collect measured throughputs for current and adjacent rates */ + window = tbl->tpc_win; + sr = window[cur].success_ratio; + current_tpt = window[cur].average_tpt; + if (weak != TPC_INVALID) + weak_tpt = window[weak].average_tpt; + if (strong != TPC_INVALID) + strong_tpt = window[strong].average_tpt; + + IWL_DEBUG_RATE(mvm, + "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", + cur, current_tpt, sr, weak, strong, + weak_tpt, strong_tpt); + + action = rs_get_tpc_action(mvm, sr, weak, strong, + current_tpt, weak_tpt, strong_tpt); + + /* override actions if we are on the edge */ + if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { + IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); + action = TPC_ACTION_STAY; + } else if (strong == TPC_INVALID && + (action == TPC_ACTION_INCREASE || + action == TPC_ACTION_NO_RESTIRCTION)) { + IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); + action = TPC_ACTION_STAY; + } + + switch (action) { + case TPC_ACTION_DECREASE: + lq_sta->lq.reduced_tpc = weak; + return true; + case TPC_ACTION_INCREASE: + lq_sta->lq.reduced_tpc = strong; + return true; + case TPC_ACTION_NO_RESTIRCTION: + lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; + return true; + case TPC_ACTION_STAY: + /* do nothing */ + break; + } + return false; +} + +/* + * Do rate scaling and search for new modulation mode. + */ +static void rs_rate_scale_perform(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + int tid) +{ + int low = IWL_RATE_INVALID; + int high = IWL_RATE_INVALID; + int index; + struct iwl_rate_scale_data *window = NULL; + int current_tpt = IWL_INVALID_VALUE; + int low_tpt = IWL_INVALID_VALUE; + int high_tpt = IWL_INVALID_VALUE; + u32 fail_count; + enum rs_action scale_action = RS_ACTION_STAY; + u16 rate_mask; + u8 update_lq = 0; + struct iwl_scale_tbl_info *tbl, *tbl1; + u8 active_tbl = 0; + u8 done_search = 0; + u16 high_low; + s32 sr; + u8 prev_agg = lq_sta->is_agg; + struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); + struct iwl_mvm_tid_data *tid_data; + struct rs_rate *rate; + + lq_sta->is_agg = !!sta_priv->agg_tids; + + /* + * Select rate-scale / modulation-mode table to work with in + * the rest of this function: "search" if searching for better + * modulation mode, or "active" if doing rate scaling within a mode. + */ + if (!lq_sta->search_better_tbl) + active_tbl = lq_sta->active_tbl; + else + active_tbl = 1 - lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + rate = &tbl->rate; + + if (prev_agg != lq_sta->is_agg) { + IWL_DEBUG_RATE(mvm, + "Aggregation changed: prev %d current %d. Update expected TPT table\n", + prev_agg, lq_sta->is_agg); + rs_set_expected_tpt_table(lq_sta, tbl); + rs_rate_scale_clear_tbl_windows(mvm, tbl); + } + + /* current tx rate */ + index = lq_sta->last_txrate_idx; + + /* rates available for this association, and for modulation mode */ + rate_mask = rs_get_supported_rates(lq_sta, rate); + + if (!(BIT(index) & rate_mask)) { + IWL_ERR(mvm, "Current Rate is not valid\n"); + if (lq_sta->search_better_tbl) { + /* revert to active table if search table is not valid*/ + rate->type = LQ_NONE; + lq_sta->search_better_tbl = 0; + tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + rs_update_rate_tbl(mvm, sta, lq_sta, tbl); + } + return; + } + + /* Get expected throughput table and history window for current rate */ + if (!tbl->expected_tpt) { + IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); + return; + } + + /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ + window = &(tbl->win[index]); + + /* + * If there is not enough history to calculate actual average + * throughput, keep analyzing results of more tx frames, without + * changing rate or mode (bypass most of the rest of this function). + * Set up new rate table in uCode only if old rate is not supported + * in current association (use new rate found above). + */ + fail_count = window->counter - window->success_counter; + if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && + (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { + IWL_DEBUG_RATE(mvm, + "(%s: %d): Test Window: succ %d total %d\n", + rs_pretty_lq_type(rate->type), + index, window->success_counter, window->counter); + + /* Can't calculate this yet; not enough history */ + window->average_tpt = IWL_INVALID_VALUE; + + /* Should we stay with this modulation mode, + * or search for a new one? */ + rs_stay_in_table(lq_sta, false); + + goto out; + } + /* Else we have enough samples; calculate estimate of + * actual average throughput */ + if (window->average_tpt != ((window->success_ratio * + tbl->expected_tpt[index] + 64) / 128)) { + window->average_tpt = ((window->success_ratio * + tbl->expected_tpt[index] + 64) / 128); + } + + /* If we are searching for better modulation mode, check success. */ + if (lq_sta->search_better_tbl) { + /* If good success, continue using the "search" mode; + * no need to send new link quality command, since we're + * continuing to use the setup that we've been trying. */ + if (window->average_tpt > lq_sta->last_tpt) { + IWL_DEBUG_RATE(mvm, + "SWITCHING TO NEW TABLE SR: %d " + "cur-tpt %d old-tpt %d\n", + window->success_ratio, + window->average_tpt, + lq_sta->last_tpt); + + /* Swap tables; "search" becomes "active" */ + lq_sta->active_tbl = active_tbl; + current_tpt = window->average_tpt; + /* Else poor success; go back to mode in "active" table */ + } else { + IWL_DEBUG_RATE(mvm, + "GOING BACK TO THE OLD TABLE: SR %d " + "cur-tpt %d old-tpt %d\n", + window->success_ratio, + window->average_tpt, + lq_sta->last_tpt); + + /* Nullify "search" table */ + rate->type = LQ_NONE; + + /* Revert to "active" table */ + active_tbl = lq_sta->active_tbl; + tbl = &(lq_sta->lq_info[active_tbl]); + + /* Revert to "active" rate and throughput info */ + index = tbl->rate.index; + current_tpt = lq_sta->last_tpt; + + /* Need to set up a new rate table in uCode */ + update_lq = 1; + } + + /* Either way, we've made a decision; modulation mode + * search is done, allow rate adjustment next time. */ + lq_sta->search_better_tbl = 0; + done_search = 1; /* Don't switch modes below! */ + goto lq_update; + } + + /* (Else) not in search of better modulation mode, try for better + * starting rate, while staying in this mode. */ + high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); + low = high_low & 0xff; + high = (high_low >> 8) & 0xff; + + /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ + + sr = window->success_ratio; + + /* Collect measured throughputs for current and adjacent rates */ + current_tpt = window->average_tpt; + if (low != IWL_RATE_INVALID) + low_tpt = tbl->win[low].average_tpt; + if (high != IWL_RATE_INVALID) + high_tpt = tbl->win[high].average_tpt; + + IWL_DEBUG_RATE(mvm, + "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", + rs_pretty_lq_type(rate->type), index, current_tpt, sr, + low, high, low_tpt, high_tpt); + + scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, + current_tpt, low_tpt, high_tpt); + + /* Force a search in case BT doesn't like us being in MIMO */ + if (is_mimo(rate) && + !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { + IWL_DEBUG_RATE(mvm, + "BT Coex forbids MIMO. Search for new config\n"); + rs_stay_in_table(lq_sta, true); + goto lq_update; + } + + switch (scale_action) { + case RS_ACTION_DOWNSCALE: + /* Decrease starting rate, update uCode's rate table */ + if (low != IWL_RATE_INVALID) { + update_lq = 1; + index = low; + } else { + IWL_DEBUG_RATE(mvm, + "At the bottom rate. Can't decrease\n"); + } + + break; + case RS_ACTION_UPSCALE: + /* Increase starting rate, update uCode's rate table */ + if (high != IWL_RATE_INVALID) { + update_lq = 1; + index = high; + } else { + IWL_DEBUG_RATE(mvm, + "At the top rate. Can't increase\n"); + } + + break; + case RS_ACTION_STAY: + /* No change */ + if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) + update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); + break; + default: + break; + } + +lq_update: + /* Replace uCode's rate table for the destination station. */ + if (update_lq) { + tbl->rate.index = index; + rs_update_rate_tbl(mvm, sta, lq_sta, tbl); + } + + rs_stay_in_table(lq_sta, false); + + /* + * Search for new modulation mode if we're: + * 1) Not changing rates right now + * 2) Not just finishing up a search + * 3) Allowing a new search + */ + if (!update_lq && !done_search && + lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED + && window->counter) { + enum rs_column next_column; + + /* Save current throughput to compare with "search" throughput*/ + lq_sta->last_tpt = current_tpt; + + IWL_DEBUG_RATE(mvm, + "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", + update_lq, done_search, lq_sta->rs_state, + window->counter); + + next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); + if (next_column != RS_COLUMN_INVALID) { + int ret = rs_switch_to_column(mvm, lq_sta, sta, + next_column); + if (!ret) + lq_sta->search_better_tbl = 1; + } else { + IWL_DEBUG_RATE(mvm, + "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); + lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; + } + + /* If new "search" mode was selected, set up in uCode table */ + if (lq_sta->search_better_tbl) { + /* Access the "search" table, clear its history. */ + tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); + rs_rate_scale_clear_tbl_windows(mvm, tbl); + + /* Use new "search" start rate */ + index = tbl->rate.index; + + rs_dump_rate(mvm, &tbl->rate, + "Switch to SEARCH TABLE:"); + rs_update_rate_tbl(mvm, sta, lq_sta, tbl); + } else { + done_search = 1; + } + } + + if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { + /* If the "active" (non-search) mode was legacy, + * and we've tried switching antennas, + * but we haven't been able to try HT modes (not available), + * stay with best antenna legacy modulation for a while + * before next round of mode comparisons. */ + tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); + if (is_legacy(&tbl1->rate)) { + IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); + + if (tid != IWL_MAX_TID_COUNT) { + tid_data = &sta_priv->tid_data[tid]; + if (tid_data->state != IWL_AGG_OFF) { + IWL_DEBUG_RATE(mvm, + "Stop aggregation on tid %d\n", + tid); + ieee80211_stop_tx_ba_session(sta, tid); + } + } + rs_set_stay_in_table(mvm, 1, lq_sta); + } else { + /* If we're in an HT mode, and all 3 mode switch actions + * have been tried and compared, stay in this best modulation + * mode for a while before next round of mode comparisons. */ + if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && + (lq_sta->tx_agg_tid_en & (1 << tid)) && + (tid != IWL_MAX_TID_COUNT)) { + tid_data = &sta_priv->tid_data[tid]; + if (tid_data->state == IWL_AGG_OFF) { + IWL_DEBUG_RATE(mvm, + "try to aggregate tid %d\n", + tid); + rs_tl_turn_on_agg(mvm, tid, + lq_sta, sta); + } + } + rs_set_stay_in_table(mvm, 0, lq_sta); + } + } + +out: + lq_sta->last_txrate_idx = index; +} + +struct rs_init_rate_info { + s8 rssi; + u8 rate_idx; +}; + +static const struct rs_init_rate_info rs_init_rates_24ghz[] = { + { -60, IWL_RATE_54M_INDEX }, + { -64, IWL_RATE_48M_INDEX }, + { -68, IWL_RATE_36M_INDEX }, + { -80, IWL_RATE_24M_INDEX }, + { -84, IWL_RATE_18M_INDEX }, + { -85, IWL_RATE_12M_INDEX }, + { -86, IWL_RATE_11M_INDEX }, + { -88, IWL_RATE_5M_INDEX }, + { -90, IWL_RATE_2M_INDEX }, + { S8_MIN, IWL_RATE_1M_INDEX }, +}; + +static const struct rs_init_rate_info rs_init_rates_5ghz[] = { + { -60, IWL_RATE_54M_INDEX }, + { -64, IWL_RATE_48M_INDEX }, + { -72, IWL_RATE_36M_INDEX }, + { -80, IWL_RATE_24M_INDEX }, + { -84, IWL_RATE_18M_INDEX }, + { -85, IWL_RATE_12M_INDEX }, + { -87, IWL_RATE_9M_INDEX }, + { S8_MIN, IWL_RATE_6M_INDEX }, +}; + +/* Choose an initial legacy rate and antenna to use based on the RSSI + * of last Rx + */ +static void rs_get_initial_rate(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + enum ieee80211_band band, + struct rs_rate *rate) +{ + int i, nentries; + s8 best_rssi = S8_MIN; + u8 best_ant = ANT_NONE; + u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); + const struct rs_init_rate_info *initial_rates; + + for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { + if (!(lq_sta->pers.chains & BIT(i))) + continue; + + if (lq_sta->pers.chain_signal[i] > best_rssi) { + best_rssi = lq_sta->pers.chain_signal[i]; + best_ant = BIT(i); + } + } + + IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", + rs_pretty_ant(best_ant), best_rssi); + + if (best_ant != ANT_A && best_ant != ANT_B) + rate->ant = first_antenna(valid_tx_ant); + else + rate->ant = best_ant; + + rate->sgi = false; + rate->ldpc = false; + rate->bw = RATE_MCS_CHAN_WIDTH_20; + + rate->index = find_first_bit(&lq_sta->active_legacy_rate, + BITS_PER_LONG); + + if (band == IEEE80211_BAND_5GHZ) { + rate->type = LQ_LEGACY_A; + initial_rates = rs_init_rates_5ghz; + nentries = ARRAY_SIZE(rs_init_rates_5ghz); + } else { + rate->type = LQ_LEGACY_G; + initial_rates = rs_init_rates_24ghz; + nentries = ARRAY_SIZE(rs_init_rates_24ghz); + } + + if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) { + for (i = 0; i < nentries; i++) { + int rate_idx = initial_rates[i].rate_idx; + if ((best_rssi >= initial_rates[i].rssi) && + (BIT(rate_idx) & lq_sta->active_legacy_rate)) { + rate->index = rate_idx; + break; + } + } + } + + IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index, + rs_pretty_ant(rate->ant)); +} + +/* Save info about RSSI of last Rx */ +void rs_update_last_rssi(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct ieee80211_rx_status *rx_status) +{ + lq_sta->pers.chains = rx_status->chains; + lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; + lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; + lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; +} + +/** + * rs_initialize_lq - Initialize a station's hardware rate table + * + * The uCode's station table contains a table of fallback rates + * for automatic fallback during transmission. + * + * NOTE: This sets up a default set of values. These will be replaced later + * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of + * rc80211_simple. + * + * NOTE: Run REPLY_ADD_STA command to set up station table entry, before + * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, + * which requires station table entry to exist). + */ +static void rs_initialize_lq(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + enum ieee80211_band band, + bool init) +{ + struct iwl_scale_tbl_info *tbl; + struct rs_rate *rate; + u8 active_tbl = 0; + + if (!sta || !lq_sta) + return; + + if (!lq_sta->search_better_tbl) + active_tbl = lq_sta->active_tbl; + else + active_tbl = 1 - lq_sta->active_tbl; + + tbl = &(lq_sta->lq_info[active_tbl]); + rate = &tbl->rate; + + rs_get_initial_rate(mvm, lq_sta, band, rate); + lq_sta->last_txrate_idx = rate->index; + + WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); + if (rate->ant == ANT_A) + tbl->column = RS_COLUMN_LEGACY_ANT_A; + else + tbl->column = RS_COLUMN_LEGACY_ANT_B; + + rs_set_expected_tpt_table(lq_sta, tbl); + rs_fill_lq_cmd(mvm, sta, lq_sta, rate); + /* TODO restore station should remember the lq cmd */ + iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); +} + +static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, + struct ieee80211_tx_rate_control *txrc) +{ + struct sk_buff *skb = txrc->skb; + struct iwl_op_mode *op_mode __maybe_unused = + (struct iwl_op_mode *)mvm_r; + struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct iwl_lq_sta *lq_sta = mvm_sta; + + if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { + /* if vif isn't initialized mvm doesn't know about + * this station, so don't do anything with the it + */ + sta = NULL; + mvm_sta = NULL; + } + + /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ + + /* Treat uninitialized rate scaling data same as non-existing. */ + if (lq_sta && !lq_sta->pers.drv) { + IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); + mvm_sta = NULL; + } + + /* Send management frames and NO_ACK data using lowest rate. */ + if (rate_control_send_low(sta, mvm_sta, txrc)) + return; + + iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, + info->band, &info->control.rates[0]); + + info->control.rates[0].count = 1; +} + +static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, + gfp_t gfp) +{ + struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); + struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; + struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); + struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; + + IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); + + lq_sta->pers.drv = mvm; +#ifdef CONFIG_MAC80211_DEBUGFS + lq_sta->pers.dbg_fixed_rate = 0; + lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; + lq_sta->pers.ss_force = RS_SS_FORCE_NONE; +#endif + lq_sta->pers.chains = 0; + memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); + + return &sta_priv->lq_sta; +} + +static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, + int nss) +{ + u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & + (0x3 << (2 * (nss - 1))); + rx_mcs >>= (2 * (nss - 1)); + + if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) + return IWL_RATE_MCS_7_INDEX; + else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) + return IWL_RATE_MCS_8_INDEX; + else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) + return IWL_RATE_MCS_9_INDEX; + + WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); + return -1; +} + +static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, + struct ieee80211_sta_vht_cap *vht_cap, + struct iwl_lq_sta *lq_sta) +{ + int i; + int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); + + if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { + for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { + if (i == IWL_RATE_9M_INDEX) + continue; + + /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ + if (i == IWL_RATE_MCS_9_INDEX && + sta->bandwidth == IEEE80211_STA_RX_BW_20) + continue; + + lq_sta->active_siso_rate |= BIT(i); + } + } + + if (sta->rx_nss < 2) + return; + + highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); + if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { + for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { + if (i == IWL_RATE_9M_INDEX) + continue; + + /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ + if (i == IWL_RATE_MCS_9_INDEX && + sta->bandwidth == IEEE80211_STA_RX_BW_20) + continue; + + lq_sta->active_mimo2_rate |= BIT(i); + } + } +} + +static void rs_ht_init(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta_ht_cap *ht_cap) +{ + /* active_siso_rate mask includes 9 MBits (bit 5), + * and CCK (bits 0-3), supp_rates[] does not; + * shift to convert format, force 9 MBits off. + */ + lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; + lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; + lq_sta->active_siso_rate &= ~((u16)0x2); + lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; + + lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; + lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; + lq_sta->active_mimo2_rate &= ~((u16)0x2); + lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; + + if (mvm->cfg->ht_params->ldpc && + (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) + lq_sta->ldpc = true; + + if (mvm->cfg->ht_params->stbc && + (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && + (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) + lq_sta->stbc_capable = true; + + lq_sta->is_vht = false; +} + +static void rs_vht_init(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + struct ieee80211_sta_vht_cap *vht_cap) +{ + rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); + + if (mvm->cfg->ht_params->ldpc && + (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) + lq_sta->ldpc = true; + + if (mvm->cfg->ht_params->stbc && + (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && + (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) + lq_sta->stbc_capable = true; + + if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) && + (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && + (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) + lq_sta->bfer_capable = true; + + lq_sta->is_vht = true; +} + +#ifdef CONFIG_IWLWIFI_DEBUGFS +static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) +{ + spin_lock_bh(&mvm->drv_stats_lock); + memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); + spin_unlock_bh(&mvm->drv_stats_lock); +} + +void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) +{ + u8 nss = 0, mcs = 0; + + spin_lock(&mvm->drv_stats_lock); + + if (agg) + mvm->drv_rx_stats.agg_frames++; + + mvm->drv_rx_stats.success_frames++; + + switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { + case RATE_MCS_CHAN_WIDTH_20: + mvm->drv_rx_stats.bw_20_frames++; + break; + case RATE_MCS_CHAN_WIDTH_40: + mvm->drv_rx_stats.bw_40_frames++; + break; + case RATE_MCS_CHAN_WIDTH_80: + mvm->drv_rx_stats.bw_80_frames++; + break; + default: + WARN_ONCE(1, "bad BW. rate 0x%x", rate); + } + + if (rate & RATE_MCS_HT_MSK) { + mvm->drv_rx_stats.ht_frames++; + mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; + nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; + } else if (rate & RATE_MCS_VHT_MSK) { + mvm->drv_rx_stats.vht_frames++; + mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; + nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> + RATE_VHT_MCS_NSS_POS) + 1; + } else { + mvm->drv_rx_stats.legacy_frames++; + } + + if (nss == 1) + mvm->drv_rx_stats.siso_frames++; + else if (nss == 2) + mvm->drv_rx_stats.mimo2_frames++; + + if (rate & RATE_MCS_SGI_MSK) + mvm->drv_rx_stats.sgi_frames++; + else + mvm->drv_rx_stats.ngi_frames++; + + mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; + mvm->drv_rx_stats.last_frame_idx = + (mvm->drv_rx_stats.last_frame_idx + 1) % + ARRAY_SIZE(mvm->drv_rx_stats.last_rates); + + spin_unlock(&mvm->drv_stats_lock); +} +#endif + +/* + * Called after adding a new station to initialize rate scaling + */ +void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, + enum ieee80211_band band, bool init) +{ + int i, j; + struct ieee80211_hw *hw = mvm->hw; + struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; + struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; + struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); + struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; + struct ieee80211_supported_band *sband; + unsigned long supp; /* must be unsigned long for for_each_set_bit */ + + /* clear all non-persistent lq data */ + memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); + + sband = hw->wiphy->bands[band]; + + lq_sta->lq.sta_id = sta_priv->sta_id; + + for (j = 0; j < LQ_SIZE; j++) + rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); + + lq_sta->flush_timer = 0; + lq_sta->last_tx = jiffies; + + IWL_DEBUG_RATE(mvm, + "LQ: *** rate scale station global init for station %d ***\n", + sta_priv->sta_id); + /* TODO: what is a good starting rate for STA? About middle? Maybe not + * the lowest or the highest rate.. Could consider using RSSI from + * previous packets? Need to have IEEE 802.1X auth succeed immediately + * after assoc.. */ + + lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; + lq_sta->band = sband->band; + /* + * active legacy rates as per supported rates bitmap + */ + supp = sta->supp_rates[sband->band]; + lq_sta->active_legacy_rate = 0; + for_each_set_bit(i, &supp, BITS_PER_LONG) + lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); + + /* TODO: should probably account for rx_highest for both HT/VHT */ + if (!vht_cap || !vht_cap->vht_supported) + rs_ht_init(mvm, sta, lq_sta, ht_cap); + else + rs_vht_init(mvm, sta, lq_sta, vht_cap); + + if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p) + lq_sta->active_mimo2_rate = 0; + + lq_sta->max_legacy_rate_idx = + rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); + lq_sta->max_siso_rate_idx = + rs_get_max_rate_from_mask(lq_sta->active_siso_rate); + lq_sta->max_mimo2_rate_idx = + rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); + + IWL_DEBUG_RATE(mvm, + "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", + lq_sta->active_legacy_rate, + lq_sta->active_siso_rate, + lq_sta->active_mimo2_rate, + lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, + lq_sta->bfer_capable); + IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", + lq_sta->max_legacy_rate_idx, + lq_sta->max_siso_rate_idx, + lq_sta->max_mimo2_rate_idx); + + /* These values will be overridden later */ + lq_sta->lq.single_stream_ant_msk = + first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); + lq_sta->lq.dual_stream_ant_msk = ANT_AB; + + /* as default allow aggregation for all tids */ + lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; + lq_sta->is_agg = 0; +#ifdef CONFIG_IWLWIFI_DEBUGFS + iwl_mvm_reset_frame_stats(mvm); +#endif + rs_initialize_lq(mvm, sta, lq_sta, band, init); +} + +static void rs_rate_update(void *mvm_r, + struct ieee80211_supported_band *sband, + struct cfg80211_chan_def *chandef, + struct ieee80211_sta *sta, void *priv_sta, + u32 changed) +{ + u8 tid; + struct iwl_op_mode *op_mode = + (struct iwl_op_mode *)mvm_r; + struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); + + if (!iwl_mvm_sta_from_mac80211(sta)->vif) + return; + + /* Stop any ongoing aggregations as rs starts off assuming no agg */ + for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) + ieee80211_stop_tx_ba_session(sta, tid); + + iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); +} + +#ifdef CONFIG_MAC80211_DEBUGFS +static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, + struct iwl_lq_cmd *lq_cmd, + enum ieee80211_band band, + u32 ucode_rate) +{ + struct rs_rate rate; + int i; + int num_rates = ARRAY_SIZE(lq_cmd->rs_table); + __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); + u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; + + for (i = 0; i < num_rates; i++) + lq_cmd->rs_table[i] = ucode_rate_le32; + + rs_rate_from_ucode_rate(ucode_rate, band, &rate); + + if (is_mimo(&rate)) + lq_cmd->mimo_delim = num_rates - 1; + else + lq_cmd->mimo_delim = 0; + + lq_cmd->reduced_tpc = 0; + + if (num_of_ant(ant) == 1) + lq_cmd->single_stream_ant_msk = ant; + + lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; +} +#endif /* CONFIG_MAC80211_DEBUGFS */ + +static void rs_fill_rates_for_column(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta, + struct rs_rate *rate, + __le32 *rs_table, int *rs_table_index, + int num_rates, int num_retries, + u8 valid_tx_ant, bool toggle_ant) +{ + int i, j; + __le32 ucode_rate; + bool bottom_reached = false; + int prev_rate_idx = rate->index; + int end = LINK_QUAL_MAX_RETRY_NUM; + int index = *rs_table_index; + + for (i = 0; i < num_rates && index < end; i++) { + for (j = 0; j < num_retries && index < end; j++, index++) { + ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, + rate)); + rs_table[index] = ucode_rate; + if (toggle_ant) + rs_toggle_antenna(valid_tx_ant, rate); + } + + prev_rate_idx = rate->index; + bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); + if (bottom_reached && !is_legacy(rate)) + break; + } + + if (!bottom_reached && !is_legacy(rate)) + rate->index = prev_rate_idx; + + *rs_table_index = index; +} + +/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI + * column the rate table should look like this: + * + * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI + * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI + * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI + * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI + * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI + * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI + * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI + * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI + * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI + * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps + * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps + * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps + * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps + * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps + * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps + * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps + */ +static void rs_build_rates_table(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + const struct rs_rate *initial_rate) +{ + struct rs_rate rate; + int num_rates, num_retries, index = 0; + u8 valid_tx_ant = 0; + struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; + bool toggle_ant = false; + + memcpy(&rate, initial_rate, sizeof(rate)); + + valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); + + /* TODO: remove old API when min FW API hits 14 */ + if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) && + rs_stbc_allow(mvm, sta, lq_sta)) + rate.stbc = true; + + if (is_siso(&rate)) { + num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; + num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; + } else if (is_mimo(&rate)) { + num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; + num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; + } else { + num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; + num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; + toggle_ant = true; + } + + rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, + num_rates, num_retries, valid_tx_ant, + toggle_ant); + + rs_get_lower_rate_down_column(lq_sta, &rate); + + if (is_siso(&rate)) { + num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; + num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; + lq_cmd->mimo_delim = index; + } else if (is_legacy(&rate)) { + num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; + num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; + } else { + WARN_ON_ONCE(1); + } + + toggle_ant = true; + + rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, + num_rates, num_retries, valid_tx_ant, + toggle_ant); + + rs_get_lower_rate_down_column(lq_sta, &rate); + + num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; + num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; + + rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, + num_rates, num_retries, valid_tx_ant, + toggle_ant); + +} + +struct rs_bfer_active_iter_data { + struct ieee80211_sta *exclude_sta; + struct iwl_mvm_sta *bfer_mvmsta; +}; + +static void rs_bfer_active_iter(void *_data, + struct ieee80211_sta *sta) +{ + struct rs_bfer_active_iter_data *data = _data; + struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); + struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; + u32 ss_params = le32_to_cpu(lq_cmd->ss_params); + + if (sta == data->exclude_sta) + return; + + /* The current sta has BFER allowed */ + if (ss_params & LQ_SS_BFER_ALLOWED) { + WARN_ON_ONCE(data->bfer_mvmsta != NULL); + + data->bfer_mvmsta = mvmsta; + } +} + +static int rs_bfer_priority(struct iwl_mvm_sta *sta) +{ + int prio = -1; + enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); + + switch (viftype) { + case NL80211_IFTYPE_AP: + case NL80211_IFTYPE_P2P_GO: + prio = 3; + break; + case NL80211_IFTYPE_P2P_CLIENT: + prio = 2; + break; + case NL80211_IFTYPE_STATION: + prio = 1; + break; + default: + WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); + prio = -1; + } + + return prio; +} + +/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ +static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, + struct iwl_mvm_sta *sta2) +{ + int prio1 = rs_bfer_priority(sta1); + int prio2 = rs_bfer_priority(sta2); + + if (prio1 > prio2) + return 1; + if (prio1 < prio2) + return -1; + return 0; +} + +static void rs_set_lq_ss_params(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + const struct rs_rate *initial_rate) +{ + struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; + struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); + struct rs_bfer_active_iter_data data = { + .exclude_sta = sta, + .bfer_mvmsta = NULL, + }; + struct iwl_mvm_sta *bfer_mvmsta = NULL; + u32 ss_params = LQ_SS_PARAMS_VALID; + + if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) + goto out; + +#ifdef CONFIG_MAC80211_DEBUGFS + /* Check if forcing the decision is configured. + * Note that SISO is forced by not allowing STBC or BFER + */ + if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) + ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); + else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) + ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); + + if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { + IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", + lq_sta->pers.ss_force); + goto out; + } +#endif + + if (lq_sta->stbc_capable) + ss_params |= LQ_SS_STBC_1SS_ALLOWED; + + if (!lq_sta->bfer_capable) + goto out; + + ieee80211_iterate_stations_atomic(mvm->hw, + rs_bfer_active_iter, + &data); + bfer_mvmsta = data.bfer_mvmsta; + + /* This code is safe as it doesn't run concurrently for different + * stations. This is guaranteed by the fact that calls to + * ieee80211_tx_status wouldn't run concurrently for a single HW. + */ + if (!bfer_mvmsta) { + IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); + + ss_params |= LQ_SS_BFER_ALLOWED; + goto out; + } + + IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", + bfer_mvmsta->sta_id); + + /* Disallow BFER on another STA if active and we're a higher priority */ + if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { + struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; + u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); + + bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; + bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); + iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); + + ss_params |= LQ_SS_BFER_ALLOWED; + IWL_DEBUG_RATE(mvm, + "Lower priority BFER sta found (%d). Switch BFER\n", + bfer_mvmsta->sta_id); + } +out: + lq_cmd->ss_params = cpu_to_le32(ss_params); +} + +static void rs_fill_lq_cmd(struct iwl_mvm *mvm, + struct ieee80211_sta *sta, + struct iwl_lq_sta *lq_sta, + const struct rs_rate *initial_rate) +{ + struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; + struct iwl_mvm_sta *mvmsta; + struct iwl_mvm_vif *mvmvif; + + lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; + lq_cmd->agg_time_limit = + cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); + +#ifdef CONFIG_MAC80211_DEBUGFS + if (lq_sta->pers.dbg_fixed_rate) { + rs_build_rates_table_from_fixed(mvm, lq_cmd, + lq_sta->band, + lq_sta->pers.dbg_fixed_rate); + return; + } +#endif + if (WARN_ON_ONCE(!sta || !initial_rate)) + return; + + rs_build_rates_table(mvm, sta, lq_sta, initial_rate); + + if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) + rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); + + if (num_of_ant(initial_rate->ant) == 1) + lq_cmd->single_stream_ant_msk = initial_rate->ant; + + mvmsta = iwl_mvm_sta_from_mac80211(sta); + mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); + + if (num_of_ant(initial_rate->ant) == 1) + lq_cmd->single_stream_ant_msk = initial_rate->ant; + + lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; + + /* + * In case of low latency, tell the firmware to leave a frame in the + * Tx Fifo so that it can start a transaction in the same TxOP. This + * basically allows the firmware to send bursts. + */ + if (iwl_mvm_vif_low_latency(mvmvif)) { + lq_cmd->agg_frame_cnt_limit--; + + if (mvm->low_latency_agg_frame_limit) + lq_cmd->agg_frame_cnt_limit = + min(lq_cmd->agg_frame_cnt_limit, + mvm->low_latency_agg_frame_limit); + } + + if (mvmsta->vif->p2p) + lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; + + lq_cmd->agg_time_limit = + cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); +} + +static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) +{ + return hw->priv; +} +/* rate scale requires free function to be implemented */ +static void rs_free(void *mvm_rate) +{ + return; +} + +static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, + void *mvm_sta) +{ + struct iwl_op_mode *op_mode __maybe_unused = mvm_r; + struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); + + IWL_DEBUG_RATE(mvm, "enter\n"); + IWL_DEBUG_RATE(mvm, "leave\n"); +} + +#ifdef CONFIG_MAC80211_DEBUGFS +int rs_pretty_print_rate(char *buf, const u32 rate) +{ + + char *type, *bw; + u8 mcs = 0, nss = 0; + u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; + + if (!(rate & RATE_MCS_HT_MSK) && + !(rate & RATE_MCS_VHT_MSK)) { + int index = iwl_hwrate_to_plcp_idx(rate); + + return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", + rs_pretty_ant(ant), + index == IWL_RATE_INVALID ? "BAD" : + iwl_rate_mcs[index].mbps); + } + + if (rate & RATE_MCS_VHT_MSK) { + type = "VHT"; + mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; + nss = ((rate & RATE_VHT_MCS_NSS_MSK) + >> RATE_VHT_MCS_NSS_POS) + 1; + } else if (rate & RATE_MCS_HT_MSK) { + type = "HT"; + mcs = rate & RATE_HT_MCS_INDEX_MSK; + } else { + type = "Unknown"; /* shouldn't happen */ + } + + switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { + case RATE_MCS_CHAN_WIDTH_20: + bw = "20Mhz"; + break; + case RATE_MCS_CHAN_WIDTH_40: + bw = "40Mhz"; + break; + case RATE_MCS_CHAN_WIDTH_80: + bw = "80Mhz"; + break; + case RATE_MCS_CHAN_WIDTH_160: + bw = "160Mhz"; + break; + default: + bw = "BAD BW"; + } + + return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", + type, rs_pretty_ant(ant), bw, mcs, nss, + (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", + (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", + (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", + (rate & RATE_MCS_BF_MSK) ? "BF " : "", + (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); +} + +/** + * Program the device to use fixed rate for frame transmit + * This is for debugging/testing only + * once the device start use fixed rate, we need to reload the module + * to being back the normal operation. + */ +static void rs_program_fix_rate(struct iwl_mvm *mvm, + struct iwl_lq_sta *lq_sta) +{ + lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ + lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ + lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ + + IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", + lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); + + if (lq_sta->pers.dbg_fixed_rate) { + rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); + iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); + } +} + +static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, + const char __user *user_buf, size_t count, loff_t *ppos) +{ + struct iwl_lq_sta *lq_sta = file->private_data; + struct iwl_mvm *mvm; + char buf[64]; + size_t buf_size; + u32 parsed_rate; + + mvm = lq_sta->pers.drv; + memset(buf, 0, sizeof(buf)); + buf_size = min(count, sizeof(buf) - 1); + if (copy_from_user(buf, user_buf, buf_size)) + return -EFAULT; + + if (sscanf(buf, "%x", &parsed_rate) == 1) + lq_sta->pers.dbg_fixed_rate = parsed_rate; + else + lq_sta->pers.dbg_fixed_rate = 0; + + rs_program_fix_rate(mvm, lq_sta); + + return count; +} + +static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, + char __user *user_buf, size_t count, loff_t *ppos) +{ + char *buff; + int desc = 0; + int i = 0; + ssize_t ret; + + struct iwl_lq_sta *lq_sta = file->private_data; + struct iwl_mvm *mvm; + struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); + struct rs_rate *rate = &tbl->rate; + u32 ss_params; + mvm = lq_sta->pers.drv; + buff = kmalloc(2048, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); + desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", + lq_sta->total_failed, lq_sta->total_success, + lq_sta->active_legacy_rate); + desc += sprintf(buff+desc, "fixed rate 0x%X\n", + lq_sta->pers.dbg_fixed_rate); + desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", + (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", + (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", + (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); + desc += sprintf(buff+desc, "lq type %s\n", + (is_legacy(rate)) ? "legacy" : + is_vht(rate) ? "VHT" : "HT"); + if (!is_legacy(rate)) { + desc += sprintf(buff + desc, " %s", + (is_siso(rate)) ? "SISO" : "MIMO2"); + desc += sprintf(buff + desc, " %s", + (is_ht20(rate)) ? "20MHz" : + (is_ht40(rate)) ? "40MHz" : + (is_ht80(rate)) ? "80Mhz" : "BAD BW"); + desc += sprintf(buff + desc, " %s %s %s\n", + (rate->sgi) ? "SGI" : "NGI", + (rate->ldpc) ? "LDPC" : "BCC", + (lq_sta->is_agg) ? "AGG on" : ""); + } + desc += sprintf(buff+desc, "last tx rate=0x%X\n", + lq_sta->last_rate_n_flags); + desc += sprintf(buff+desc, + "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", + lq_sta->lq.flags, + lq_sta->lq.mimo_delim, + lq_sta->lq.single_stream_ant_msk, + lq_sta->lq.dual_stream_ant_msk); + + desc += sprintf(buff+desc, + "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", + le16_to_cpu(lq_sta->lq.agg_time_limit), + lq_sta->lq.agg_disable_start_th, + lq_sta->lq.agg_frame_cnt_limit); + + desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); + ss_params = le32_to_cpu(lq_sta->lq.ss_params); + desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", + (ss_params & LQ_SS_PARAMS_VALID) ? + "VALID" : "INVALID", + (ss_params & LQ_SS_BFER_ALLOWED) ? + ", BFER" : "", + (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? + ", STBC" : "", + (ss_params & LQ_SS_FORCE) ? + ", FORCE" : ""); + desc += sprintf(buff+desc, + "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", + lq_sta->lq.initial_rate_index[0], + lq_sta->lq.initial_rate_index[1], + lq_sta->lq.initial_rate_index[2], + lq_sta->lq.initial_rate_index[3]); + + for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { + u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); + + desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); + desc += rs_pretty_print_rate(buff+desc, r); + } + + ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); + kfree(buff); + return ret; +} + +static const struct file_operations rs_sta_dbgfs_scale_table_ops = { + .write = rs_sta_dbgfs_scale_table_write, + .read = rs_sta_dbgfs_scale_table_read, + .open = simple_open, + .llseek = default_llseek, +}; +static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, + char __user *user_buf, size_t count, loff_t *ppos) +{ + char *buff; + int desc = 0; + int i, j; + ssize_t ret; + struct iwl_scale_tbl_info *tbl; + struct rs_rate *rate; + struct iwl_lq_sta *lq_sta = file->private_data; + + buff = kmalloc(1024, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + for (i = 0; i < LQ_SIZE; i++) { + tbl = &(lq_sta->lq_info[i]); + rate = &tbl->rate; + desc += sprintf(buff+desc, + "%s type=%d SGI=%d BW=%s DUP=0\n" + "index=%d\n", + lq_sta->active_tbl == i ? "*" : "x", + rate->type, + rate->sgi, + is_ht20(rate) ? "20Mhz" : + is_ht40(rate) ? "40Mhz" : + is_ht80(rate) ? "80Mhz" : "ERR", + rate->index); + for (j = 0; j < IWL_RATE_COUNT; j++) { + desc += sprintf(buff+desc, + "counter=%d success=%d %%=%d\n", + tbl->win[j].counter, + tbl->win[j].success_counter, + tbl->win[j].success_ratio); + } + } + ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); + kfree(buff); + return ret; +} + +static const struct file_operations rs_sta_dbgfs_stats_table_ops = { + .read = rs_sta_dbgfs_stats_table_read, + .open = simple_open, + .llseek = default_llseek, +}; + +static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + static const char * const column_name[] = { + [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", + [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", + [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", + [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", + [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", + [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", + [RS_COLUMN_MIMO2] = "MIMO2", + [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", + }; + + static const char * const rate_name[] = { + [IWL_RATE_1M_INDEX] = "1M", + [IWL_RATE_2M_INDEX] = "2M", + [IWL_RATE_5M_INDEX] = "5.5M", + [IWL_RATE_11M_INDEX] = "11M", + [IWL_RATE_6M_INDEX] = "6M|MCS0", + [IWL_RATE_9M_INDEX] = "9M", + [IWL_RATE_12M_INDEX] = "12M|MCS1", + [IWL_RATE_18M_INDEX] = "18M|MCS2", + [IWL_RATE_24M_INDEX] = "24M|MCS3", + [IWL_RATE_36M_INDEX] = "36M|MCS4", + [IWL_RATE_48M_INDEX] = "48M|MCS5", + [IWL_RATE_54M_INDEX] = "54M|MCS6", + [IWL_RATE_MCS_7_INDEX] = "MCS7", + [IWL_RATE_MCS_8_INDEX] = "MCS8", + [IWL_RATE_MCS_9_INDEX] = "MCS9", + }; + + char *buff, *pos, *endpos; + int col, rate; + ssize_t ret; + struct iwl_lq_sta *lq_sta = file->private_data; + struct rs_rate_stats *stats; + static const size_t bufsz = 1024; + + buff = kmalloc(bufsz, GFP_KERNEL); + if (!buff) + return -ENOMEM; + + pos = buff; + endpos = pos + bufsz; + + pos += scnprintf(pos, endpos - pos, "COLUMN,"); + for (rate = 0; rate < IWL_RATE_COUNT; rate++) + pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); + pos += scnprintf(pos, endpos - pos, "\n"); + + for (col = 0; col < RS_COLUMN_COUNT; col++) { + pos += scnprintf(pos, endpos - pos, + "%s,", column_name[col]); + + for (rate = 0; rate < IWL_RATE_COUNT; rate++) { + stats = &(lq_sta->pers.tx_stats[col][rate]); + pos += scnprintf(pos, endpos - pos, + "%llu/%llu,", + stats->success, + stats->total); + } + pos += scnprintf(pos, endpos - pos, "\n"); + } + + ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); + kfree(buff); + return ret; +} + +static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, + const char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct iwl_lq_sta *lq_sta = file->private_data; + memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); + + return count; +} + +static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { + .read = rs_sta_dbgfs_drv_tx_stats_read, + .write = rs_sta_dbgfs_drv_tx_stats_write, + .open = simple_open, + .llseek = default_llseek, +}; + +static ssize_t iwl_dbgfs_ss_force_read(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct iwl_lq_sta *lq_sta = file->private_data; + char buf[12]; + int bufsz = sizeof(buf); + int pos = 0; + static const char * const ss_force_name[] = { + [RS_SS_FORCE_NONE] = "none", + [RS_SS_FORCE_STBC] = "stbc", + [RS_SS_FORCE_BFER] = "bfer", + [RS_SS_FORCE_SISO] = "siso", + }; + + pos += scnprintf(buf+pos, bufsz-pos, "%s\n", + ss_force_name[lq_sta->pers.ss_force]); + return simple_read_from_buffer(user_buf, count, ppos, buf, pos); +} + +static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, + size_t count, loff_t *ppos) +{ + struct iwl_mvm *mvm = lq_sta->pers.drv; + int ret = 0; + + if (!strncmp("none", buf, 4)) { + lq_sta->pers.ss_force = RS_SS_FORCE_NONE; + } else if (!strncmp("siso", buf, 4)) { + lq_sta->pers.ss_force = RS_SS_FORCE_SISO; + } else if (!strncmp("stbc", buf, 4)) { + if (lq_sta->stbc_capable) { + lq_sta->pers.ss_force = RS_SS_FORCE_STBC; + } else { + IWL_ERR(mvm, + "can't force STBC. peer doesn't support\n"); + ret = -EINVAL; + } + } else if (!strncmp("bfer", buf, 4)) { + if (lq_sta->bfer_capable) { + lq_sta->pers.ss_force = RS_SS_FORCE_BFER; + } else { + IWL_ERR(mvm, + "can't force BFER. peer doesn't support\n"); + ret = -EINVAL; + } + } else { + IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); + ret = -EINVAL; + } + return ret ?: count; +} + +#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ + _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) +#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ + if (!debugfs_create_file(#name, mode, parent, lq_sta, \ + &iwl_dbgfs_##name##_ops)) \ + goto err; \ + } while (0) + +MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); + +static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) +{ + struct iwl_lq_sta *lq_sta = priv_sta; + struct iwl_mvm_sta *mvmsta; + + mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); + + if (!mvmsta->vif) + return; + + debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, + lq_sta, &rs_sta_dbgfs_scale_table_ops); + debugfs_create_file("rate_stats_table", S_IRUSR, dir, + lq_sta, &rs_sta_dbgfs_stats_table_ops); + debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, + lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); + debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, + &lq_sta->tx_agg_tid_en); + debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, + &lq_sta->pers.dbg_fixed_txp_reduction); + + MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); + return; +err: + IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); +} + +static void rs_remove_debugfs(void *mvm, void *mvm_sta) +{ +} +#endif + +/* + * Initialization of rate scaling information is done by driver after + * the station is added. Since mac80211 calls this function before a + * station is added we ignore it. + */ +static void rs_rate_init_stub(void *mvm_r, + struct ieee80211_supported_band *sband, + struct cfg80211_chan_def *chandef, + struct ieee80211_sta *sta, void *mvm_sta) +{ +} + +static const struct rate_control_ops rs_mvm_ops = { + .name = RS_NAME, + .tx_status = rs_mac80211_tx_status, + .get_rate = rs_get_rate, + .rate_init = rs_rate_init_stub, + .alloc = rs_alloc, + .free = rs_free, + .alloc_sta = rs_alloc_sta, + .free_sta = rs_free_sta, + .rate_update = rs_rate_update, +#ifdef CONFIG_MAC80211_DEBUGFS + .add_sta_debugfs = rs_add_debugfs, + .remove_sta_debugfs = rs_remove_debugfs, +#endif +}; + +int iwl_mvm_rate_control_register(void) +{ + return ieee80211_rate_control_register(&rs_mvm_ops); +} + +void iwl_mvm_rate_control_unregister(void) +{ + ieee80211_rate_control_unregister(&rs_mvm_ops); +} + +/** + * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable + * Tx protection, according to this request and previous requests, + * and send the LQ command. + * @mvmsta: The station + * @enable: Enable Tx protection? + */ +int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, + bool enable) +{ + struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; + + lockdep_assert_held(&mvm->mutex); + + if (enable) { + if (mvmsta->tx_protection == 0) + lq->flags |= LQ_FLAG_USE_RTS_MSK; + mvmsta->tx_protection++; + } else { + mvmsta->tx_protection--; + if (mvmsta->tx_protection == 0) + lq->flags &= ~LQ_FLAG_USE_RTS_MSK; + } + + return iwl_mvm_send_lq_cmd(mvm, lq, false); +} |