/****************************************************************************** * * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved. * * 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 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include #include #include #include #include "iwl-dev.h" #include "iwl-sta.h" #include "iwl-core.h" #define RS_NAME "iwl-agn-rs" #define NUM_TRY_BEFORE_ANT_TOGGLE 1 #define IWL_NUMBER_TRY 1 #define IWL_HT_NUMBER_TRY 3 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */ #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */ /* max allowed rate miss before sync LQ cmd */ #define IWL_MISSED_RATE_MAX 15 /* max time to accum history 2 seconds */ #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) static u8 rs_ht_to_legacy[] = { IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX, IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX, IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX, IWL_RATE_48M_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, }; /** * struct iwl_rate_scale_data -- tx success history for one rate */ struct iwl_rate_scale_data { u64 data; /* bitmap of successful frames */ s32 success_counter; /* number of frames successful */ s32 success_ratio; /* per-cent * 128 */ s32 counter; /* number of frames attempted */ s32 average_tpt; /* success ratio * expected throughput */ unsigned long stamp; }; /** * struct iwl_scale_tbl_info -- tx params and success history for all rates * * There are two of these in struct iwl_lq_sta, * one for "active", and one for "search". */ struct iwl_scale_tbl_info { enum iwl_table_type lq_type; u8 ant_type; u8 is_SGI; /* 1 = short guard interval */ u8 is_fat; /* 1 = 40 MHz channel width */ u8 is_dup; /* 1 = duplicated data streams */ u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */ s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */ u32 current_rate; /* rate_n_flags, uCode API format */ struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ }; struct iwl_traffic_load { unsigned long time_stamp; /* age of the oldest statistics */ u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time * slice */ u32 total; /* total num of packets during the * last TID_MAX_TIME_DIFF */ u8 queue_count; /* number of queues that has * been used since the last cleanup */ u8 head; /* start of the circular buffer */ }; /** * struct iwl_lq_sta -- driver's rate scaling private structure * * Pointer to this gets passed back and forth between driver and mac80211. */ struct iwl_lq_sta { u8 active_tbl; /* index of active table, range 0-1 */ u8 enable_counter; /* indicates HT mode */ u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */ u8 search_better_tbl; /* 1: currently trying alternate mode */ s32 last_tpt; /* The following determine when to search for a new mode */ u32 table_count_limit; u32 max_failure_limit; /* # failed frames before new search */ u32 max_success_limit; /* # successful frames before new search */ u32 table_count; u32 total_failed; /* total failed frames, any/all rates */ u32 total_success; /* total successful frames, any/all rates */ u32 flush_timer; /* time staying in mode before new search */ u8 action_counter; /* # mode-switch actions tried */ u8 is_green; u8 is_dup; enum ieee80211_band band; u8 ibss_sta_added; /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */ u32 supp_rates; u16 active_legacy_rate; u16 active_siso_rate; u16 active_mimo2_rate; u16 active_mimo3_rate; u16 active_rate_basic; s8 max_rate_idx; /* Max rate set by user */ u8 missed_rate_counter; struct iwl_link_quality_cmd lq; struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ struct iwl_traffic_load load[TID_MAX_LOAD_COUNT]; u8 tx_agg_tid_en; #ifdef CONFIG_MAC80211_DEBUGFS struct dentry *rs_sta_dbgfs_scale_table_file; struct dentry *rs_sta_dbgfs_stats_table_file; struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file; u32 dbg_fixed_rate; #endif struct iwl_priv *drv; /* used to be in sta_info */ int last_txrate_idx; }; static void rs_rate_scale_perform(struct iwl_priv *priv, struct ieee80211_hdr *hdr, struct ieee80211_sta *sta, struct iwl_lq_sta *lq_sta); static void rs_fill_link_cmd(const struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, u32 rate_n_flags); #ifdef CONFIG_MAC80211_DEBUGFS static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, u32 *rate_n_flags, int index); #else static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, u32 *rate_n_flags, int index) {} #endif /* * Expected throughput metrics for following rates: * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits * "G" is the only table that supports CCK (the first 4 rates). */ /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/ static s32 expected_tpt_A[IWL_RATE_COUNT] = { 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186 }; static s32 expected_tpt_G[IWL_RATE_COUNT] = { 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186 }; static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = { 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202 }; static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = { 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211 }; static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = { 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251 }; static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = { 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257 }; static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = { 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257 }; static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = { 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264 }; static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = { 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289 }; static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = { 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293 }; static inline u8 rs_extract_rate(u32 rate_n_flags) { return (u8)(rate_n_flags & 0xFF); } 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; window->stamp = 0; } static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) { return (ant_type & valid_antenna) == ant_type; } /* * removes the old data from the statistics. All data that is older than * TID_MAX_TIME_DIFF, will be deleted. */ static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time) { /* The oldest age we want to keep */ u32 oldest_time = curr_time - TID_MAX_TIME_DIFF; while (tl->queue_count && (tl->time_stamp < oldest_time)) { tl->total -= tl->packet_count[tl->head]; tl->packet_count[tl->head] = 0; tl->time_stamp += TID_QUEUE_CELL_SPACING; tl->queue_count--; tl->head++; if (tl->head >= TID_QUEUE_MAX_SIZE) tl->head = 0; } } /* * increment traffic load value for tid and also remove * any old values if passed the certain time period */ static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data, struct ieee80211_hdr *hdr) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 index; struct iwl_traffic_load *tl = NULL; u8 tid; if (ieee80211_is_data_qos(hdr->frame_control)) { u8 *qc = ieee80211_get_qos_ctl(hdr); tid = qc[0] & 0xf; } else return MAX_TID_COUNT; tl = &lq_data->load[tid]; curr_time -= curr_time % TID_ROUND_VALUE; /* Happens only for the first packet. Initialize the data */ if (!(tl->queue_count)) { tl->total = 1; tl->time_stamp = curr_time; tl->queue_count = 1; tl->head = 0; tl->packet_count[0] = 1; return MAX_TID_COUNT; } time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); index = time_diff / TID_QUEUE_CELL_SPACING; /* The history is too long: remove data that is older than */ /* TID_MAX_TIME_DIFF */ if (index >= TID_QUEUE_MAX_SIZE) rs_tl_rm_old_stats(tl, curr_time); index = (tl->head + index) % TID_QUEUE_MAX_SIZE; tl->packet_count[index] = tl->packet_count[index] + 1; tl->total = tl->total + 1; if ((index + 1) > tl->queue_count) tl->queue_count = index + 1; return tid; } /* get the traffic load value for tid */ static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 index; struct iwl_traffic_load *tl = NULL; if (tid >= TID_MAX_LOAD_COUNT) return 0; tl = &(lq_data->load[tid]); curr_time -= curr_time % TID_ROUND_VALUE; if (!(tl->queue_count)) return 0; time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time); index = time_diff / TID_QUEUE_CELL_SPACING; /* The history is too long: remove data that is older than */ /* TID_MAX_TIME_DIFF */ if (index >= TID_QUEUE_MAX_SIZE) rs_tl_rm_old_stats(tl, curr_time); return tl->total; } static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv, struct iwl_lq_sta *lq_data, u8 tid, struct ieee80211_sta *sta) { if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) { IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid); ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid); } } static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid, struct iwl_lq_sta *lq_data, struct ieee80211_sta *sta) { if ((tid < TID_MAX_LOAD_COUNT)) rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); else if (tid == IWL_AGG_ALL_TID) for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++) rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta); } 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); } /** * 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_rate_scale_data *windows, int scale_index, s32 tpt, int retries, int successes) { struct iwl_rate_scale_data *window = NULL; static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); s32 fail_count; if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) return -EINVAL; /* Select data for current tx bit rate */ window = &(windows[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 (retries > 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 (throw away oldest history), * OR in "1", and increment "success" if this * frame was successful. */ window->data <<= 1; if (successes > 0) { window->success_counter++; window->data |= 0x1; successes--; } retries--; } /* 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_RATE_MIN_FAILURE_TH) || (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) window->average_tpt = (window->success_ratio * tpt + 64) / 128; else window->average_tpt = IWL_INVALID_VALUE; /* Tag this window as having been updated */ window->stamp = jiffies; return 0; } /* * Fill uCode API rate_n_flags field, based on "search" or "active" table. */ /* FIXME:RS:remove this function and put the flags statically in the table */ static u32 rate_n_flags_from_tbl(struct iwl_priv *priv, struct iwl_scale_tbl_info *tbl, int index, u8 use_green) { u32 rate_n_flags = 0; if (is_legacy(tbl->lq_type)) { rate_n_flags = iwl_rates[index].plcp; if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) rate_n_flags |= RATE_MCS_CCK_MSK; } else if (is_Ht(tbl->lq_type)) { if (index > IWL_LAST_OFDM_RATE) { IWL_ERR(priv, "Invalid HT rate index %d\n", index); index = IWL_LAST_OFDM_RATE; } rate_n_flags = RATE_MCS_HT_MSK; if (is_siso(tbl->lq_type)) rate_n_flags |= iwl_rates[index].plcp_siso; else if (is_mimo2(tbl->lq_type)) rate_n_flags |= iwl_rates[index].plcp_mimo2; else rate_n_flags |= iwl_rates[index].plcp_mimo3; } else { IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type); } rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK); if (is_Ht(tbl->lq_type)) { if (tbl->is_fat) { if (tbl->is_dup) rate_n_flags |= RATE_MCS_DUP_MSK; else rate_n_flags |= RATE_MCS_FAT_MSK; } if (tbl->is_SGI) rate_n_flags |= RATE_MCS_SGI_MSK; if (use_green) { rate_n_flags |= RATE_MCS_GF_MSK; if (is_siso(tbl->lq_type) && tbl->is_SGI) { rate_n_flags &= ~RATE_MCS_SGI_MSK; IWL_ERR(priv, "GF was set with SGI:SISO\n"); } } } return rate_n_flags; } /* * Interpret uCode API's rate_n_flags format, * fill "search" or "active" tx mode table. */ static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags, enum ieee80211_band band, struct iwl_scale_tbl_info *tbl, int *rate_idx) { u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK); u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags); u8 mcs; *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); if (*rate_idx == IWL_RATE_INVALID) { *rate_idx = -1; return -EINVAL; } tbl->is_SGI = 0; /* default legacy setup */ tbl->is_fat = 0; tbl->is_dup = 0; tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS); tbl->lq_type = LQ_NONE; /* legacy rate format */ if (!(rate_n_flags & RATE_MCS_HT_MSK)) { if (num_of_ant == 1) { if (band == IEEE80211_BAND_5GHZ) tbl->lq_type = LQ_A; else tbl->lq_type = LQ_G; } /* HT rate format */ } else { if (rate_n_flags & RATE_MCS_SGI_MSK) tbl->is_SGI = 1; if ((rate_n_flags & RATE_MCS_FAT_MSK) || (rate_n_flags & RATE_MCS_DUP_MSK)) tbl->is_fat = 1; if (rate_n_flags & RATE_MCS_DUP_MSK) tbl->is_dup = 1; mcs = rs_extract_rate(rate_n_flags); /* SISO */ if (mcs <= IWL_RATE_SISO_60M_PLCP) { if (num_of_ant == 1) tbl->lq_type = LQ_SISO; /*else NONE*/ /* MIMO2 */ } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) { if (num_of_ant == 2) tbl->lq_type = LQ_MIMO2; /* MIMO3 */ } else { if (num_of_ant == 3) tbl->lq_type = LQ_MIMO3; } } 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, u32 *rate_n_flags, struct iwl_scale_tbl_info *tbl) { u8 new_ant_type; if (!tbl->ant_type || tbl->ant_type > ANT_ABC) return 0; if (!rs_is_valid_ant(valid_ant, tbl->ant_type)) return 0; new_ant_type = ant_toggle_lookup[tbl->ant_type]; while ((new_ant_type != tbl->ant_type) && !rs_is_valid_ant(valid_ant, new_ant_type)) new_ant_type = ant_toggle_lookup[new_ant_type]; if (new_ant_type == tbl->ant_type) return 0; tbl->ant_type = new_ant_type; *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK; *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS; return 1; } /* FIXME:RS: in 4965 we don't use greenfield at all */ /* FIXME:RS: don't use greenfield for now in TX */ #if 0 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) { return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) && priv->current_ht_config.is_green_field && !priv->current_ht_config.non_GF_STA_present; } #endif static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) { return 0; } /** * rs_get_supported_rates - get the available rates * * if management frame or broadcast frame only return * basic available rates. * */ static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, struct ieee80211_hdr *hdr, enum iwl_table_type rate_type) { if (hdr && is_multicast_ether_addr(hdr->addr1) && lq_sta->active_rate_basic) return lq_sta->active_rate_basic; if (is_legacy(rate_type)) { return lq_sta->active_legacy_rate; } else { if (is_siso(rate_type)) return lq_sta->active_siso_rate; else if (is_mimo2(rate_type)) return lq_sta->active_mimo2_rate; else return lq_sta->active_mimo3_rate; } } static u16 rs_get_adjacent_rate(struct iwl_priv *priv, 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_a_band(rate_type) || !is_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; IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); } 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; IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); } return (high << 8) | low; } static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta, struct iwl_scale_tbl_info *tbl, u8 scale_index, u8 ht_possible) { s32 low; u16 rate_mask; u16 high_low; u8 switch_to_legacy = 0; u8 is_green = lq_sta->is_green; /* check if we need to switch from HT to legacy rates. * assumption is that mandatory rates (1Mbps or 6Mbps) * are always supported (spec demand) */ if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) { switch_to_legacy = 1; scale_index = rs_ht_to_legacy[scale_index]; if (lq_sta->band == IEEE80211_BAND_5GHZ) tbl->lq_type = LQ_A; else tbl->lq_type = LQ_G; if (num_of_ant(tbl->ant_type) > 1) tbl->ant_type = ANT_A;/*FIXME:RS*/ tbl->is_fat = 0; tbl->is_SGI = 0; } rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type); /* Mask with station rate restriction */ if (is_legacy(tbl->lq_type)) { /* supp_rates has no CCK bits in A mode */ if (lq_sta->band == IEEE80211_BAND_5GHZ) rate_mask = (u16)(rate_mask & (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); else rate_mask = (u16)(rate_mask & lq_sta->supp_rates); } /* If we switched from HT to legacy, check current rate */ if (switch_to_legacy && (rate_mask & (1 << scale_index))) { low = scale_index; goto out; } high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask, tbl->lq_type); low = high_low & 0xff; if (low == IWL_RATE_INVALID) low = scale_index; out: return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green); } /* * mac80211 sends us Tx status */ static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta, struct sk_buff *skb) { int status; u8 retries; int rs_index, index = 0; struct iwl_lq_sta *lq_sta = priv_sta; struct iwl_link_quality_cmd *table; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct iwl_priv *priv = (struct iwl_priv *)priv_r; struct ieee80211_hw *hw = priv->hw; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_rate_scale_data *window = NULL; struct iwl_rate_scale_data *search_win = NULL; u32 tx_rate; struct iwl_scale_tbl_info tbl_type; struct iwl_scale_tbl_info *curr_tbl, *search_tbl; u8 active_index = 0; s32 tpt = 0; IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n"); if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) return; /* This packet was aggregated but doesn't carry rate scale info */ if ((info->flags & IEEE80211_TX_CTL_AMPDU) && !(info->flags & IEEE80211_TX_STAT_AMPDU)) return; if (info->flags & IEEE80211_TX_STAT_AMPDU) retries = 0; else retries = info->status.rates[0].count - 1; if (retries > 15) retries = 15; if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && !lq_sta->ibss_sta_added) goto out; table = &lq_sta->lq; active_index = lq_sta->active_tbl; curr_tbl = &(lq_sta->lq_info[active_index]); search_tbl = &(lq_sta->lq_info[(1 - active_index)]); window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]); search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]); /* * 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). */ tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags); rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); if (priv->band == IEEE80211_BAND_5GHZ) rs_index -= IWL_FIRST_OFDM_RATE; if ((info->status.rates[0].idx < 0) || (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) || (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) || (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) || (tbl_type.ant_type != info->antenna_sel_tx) || (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) || (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) || (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate != hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) { IWL_DEBUG_RATE(priv, "initial rate does not match 0x%x\n", tx_rate); /* the last LQ command could failed so the LQ in ucode not * the same in driver sync up */ lq_sta->missed_rate_counter++; if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) { lq_sta->missed_rate_counter = 0; iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); } goto out; } lq_sta->missed_rate_counter = 0; /* Update frame history window with "failure" for each Tx retry. */ while (retries) { /* Look up the rate and other info used for each tx attempt. * Each tx attempt steps one entry deeper in the rate table. */ tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); /* If type matches "search" table, * add failure to "search" history */ if ((tbl_type.lq_type == search_tbl->lq_type) && (tbl_type.ant_type == search_tbl->ant_type) && (tbl_type.is_SGI == search_tbl->is_SGI)) { if (search_tbl->expected_tpt) tpt = search_tbl->expected_tpt[rs_index]; else tpt = 0; rs_collect_tx_data(search_win, rs_index, tpt, 1, 0); /* Else if type matches "current/active" table, * add failure to "current/active" history */ } else if ((tbl_type.lq_type == curr_tbl->lq_type) && (tbl_type.ant_type == curr_tbl->ant_type) && (tbl_type.is_SGI == curr_tbl->is_SGI)) { if (curr_tbl->expected_tpt) tpt = curr_tbl->expected_tpt[rs_index]; else tpt = 0; rs_collect_tx_data(window, rs_index, tpt, 1, 0); } /* If not searching for a new mode, increment failed counter * ... this helps determine when to start searching again */ if (lq_sta->stay_in_tbl) lq_sta->total_failed++; --retries; index++; } /* * Find (by rate) the history window to update with final Tx attempt; * if Tx was successful first try, use original rate, * else look up the rate that was, finally, successful. */ tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index); /* Update frame history window with "success" if Tx got ACKed ... */ status = !!(info->flags & IEEE80211_TX_STAT_ACK); /* If type matches "search" table, * add final tx status to "search" history */ if ((tbl_type.lq_type == search_tbl->lq_type) && (tbl_type.ant_type == search_tbl->ant_type) && (tbl_type.is_SGI == search_tbl->is_SGI)) { if (search_tbl->expected_tpt) tpt = search_tbl->expected_tpt[rs_index]; else tpt = 0; if (info->flags & IEEE80211_TX_STAT_AMPDU) rs_collect_tx_data(search_win, rs_index, tpt, info->status.ampdu_ack_len, info->status.ampdu_ack_map); else rs_collect_tx_data(search_win, rs_index, tpt, 1, status); /* Else if type matches "current/active" table, * add final tx status to "current/active" history */ } else if ((tbl_type.lq_type == curr_tbl->lq_type) && (tbl_type.ant_type == curr_tbl->ant_type) && (tbl_type.is_SGI == curr_tbl->is_SGI)) { if (curr_tbl->expected_tpt) tpt = curr_tbl->expected_tpt[rs_index]; else tpt = 0; if (info->flags & IEEE80211_TX_STAT_AMPDU) rs_collect_tx_data(window, rs_index, tpt, info->status.ampdu_ack_len, info->status.ampdu_ack_map); else rs_collect_tx_data(window, rs_index, tpt, 1, status); } /* If not searching for new mode, increment success/failed counter * ... these help determine when to start searching again */ if (lq_sta->stay_in_tbl) { if (info->flags & IEEE80211_TX_STAT_AMPDU) { lq_sta->total_success += info->status.ampdu_ack_map; lq_sta->total_failed += (info->status.ampdu_ack_len - info->status.ampdu_ack_map); } else { if (status) lq_sta->total_success++; else lq_sta->total_failed++; } } /* See if there's a better rate or modulation mode to try. */ if (sta && sta->supp_rates[sband->band]) rs_rate_scale_perform(priv, hdr, sta, lq_sta); out: return; } /* * 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_priv *priv, u8 is_legacy, struct iwl_lq_sta *lq_sta) { IWL_DEBUG_RATE(priv, "we are staying in the same table\n"); lq_sta->stay_in_tbl = 1; /* only place this gets set */ if (is_legacy) { lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT; lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT; } else { lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; } lq_sta->table_count = 0; lq_sta->total_failed = 0; lq_sta->total_success = 0; } /* * Find correct throughput table for given mode of modulation */ static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, struct iwl_scale_tbl_info *tbl) { if (is_legacy(tbl->lq_type)) { if (!is_a_band(tbl->lq_type)) tbl->expected_tpt = expected_tpt_G; else tbl->expected_tpt = expected_tpt_A; } else if (is_siso(tbl->lq_type)) { if (tbl->is_fat && !lq_sta->is_dup) if (tbl->is_SGI) tbl->expected_tpt = expected_tpt_siso40MHzSGI; else tbl->expected_tpt = expected_tpt_siso40MHz; else if (tbl->is_SGI) tbl->expected_tpt = expected_tpt_siso20MHzSGI; else tbl->expected_tpt = expected_tpt_siso20MHz; } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */ if (tbl->is_fat && !lq_sta->is_dup) if (tbl->is_SGI) tbl->expected_tpt = expected_tpt_mimo40MHzSGI; else tbl->expected_tpt = expected_tpt_mimo40MHz; else if (tbl->is_SGI) tbl->expected_tpt = expected_tpt_mimo20MHzSGI; else tbl->expected_tpt = expected_tpt_mimo20MHz; } else tbl->expected_tpt = expected_tpt_G; } /* * Find starting rate for new "search" high-throughput mode of modulation. * Goal is to find lowest expected rate (under perfect conditions) that is * above the current measured throughput of "active" mode, to give new mode * a fair chance to prove itself without too many challenges. * * This gets called when transitioning to more aggressive modulation * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need * to decrease to match "active" throughput. When moving from MIMO to SISO, * bit rate will typically need to increase, but not if performance was bad. */ static s32 rs_get_best_rate(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct iwl_scale_tbl_info *tbl, /* "search" */ u16 rate_mask, s8 index) { /* "active" values */ struct iwl_scale_tbl_info *active_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); s32 active_sr = active_tbl->win[index].success_ratio; s32 active_tpt = active_tbl->expected_tpt[index]; /* expected "search" throughput */ s32 *tpt_tbl = tbl->expected_tpt; s32 new_rate, high, low, start_hi; u16 high_low; s8 rate = index; new_rate = high = low = start_hi = IWL_RATE_INVALID; for (; ;) { high_low = rs_get_adjacent_rate(priv, rate, rate_mask, tbl->lq_type); low = high_low & 0xff; high = (high_low >> 8) & 0xff; /* * Lower the "search" bit rate, to give new "search" mode * approximately the same throughput as "active" if: * * 1) "Active" mode has been working modestly well (but not * great), and expected "search" throughput (under perfect * conditions) at candidate rate is above the actual * measured "active" throughput (but less than expected * "active" throughput under perfect conditions). * OR * 2) "Active" mode has been working perfectly or very well * and expected "search" throughput (under perfect * conditions) at candidate rate is above expected * "active" throughput (under perfect conditions). */ if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) && ((active_sr > IWL_RATE_DECREASE_TH) && (active_sr <= IWL_RATE_HIGH_TH) && (tpt_tbl[rate] <= active_tpt))) || ((active_sr >= IWL_RATE_SCALE_SWITCH) && (tpt_tbl[rate] > active_tpt))) { /* (2nd or later pass) * If we've already tried to raise the rate, and are * now trying to lower it, use the higher rate. */ if (start_hi != IWL_RATE_INVALID) { new_rate = start_hi; break; } new_rate = rate; /* Loop again with lower rate */ if (low != IWL_RATE_INVALID) rate = low; /* Lower rate not available, use the original */ else break; /* Else try to raise the "search" rate to match "active" */ } else { /* (2nd or later pass) * If we've already tried to lower the rate, and are * now trying to raise it, use the lower rate. */ if (new_rate != IWL_RATE_INVALID) break; /* Loop again with higher rate */ else if (high != IWL_RATE_INVALID) { start_hi = high; rate = high; /* Higher rate not available, use the original */ } else { new_rate = rate; break; } } } return new_rate; } /* * Set up search table for MIMO */ static int rs_switch_to_mimo2(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct iwl_scale_tbl_info *tbl, int index) { u16 rate_mask; s32 rate; s8 is_green = lq_sta->is_green; if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) return -1; if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) == WLAN_HT_CAP_SM_PS_STATIC) return -1; /* Need both Tx chains/antennas to support MIMO */ if (priv->hw_params.tx_chains_num < 2) return -1; IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n"); tbl->lq_type = LQ_MIMO2; tbl->is_dup = lq_sta->is_dup; tbl->action = 0; rate_mask = lq_sta->active_mimo2_rate; if (priv->current_ht_config.supported_chan_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; /* FIXME: - don't toggle SGI here if (tbl->is_fat) { if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; */ rs_set_expected_tpt_table(lq_sta, tbl); rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask); if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n", rate, rate_mask); return -1; } tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", tbl->current_rate, is_green); return 0; } /* * Set up search table for SISO */ static int rs_switch_to_siso(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct iwl_scale_tbl_info *tbl, int index) { u16 rate_mask; u8 is_green = lq_sta->is_green; s32 rate; if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported) return -1; IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n"); tbl->is_dup = lq_sta->is_dup; tbl->lq_type = LQ_SISO; tbl->action = 0; rate_mask = lq_sta->active_siso_rate; if (priv->current_ht_config.supported_chan_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; /* FIXME: - don't toggle SGI here if (tbl->is_fat) { if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; */ if (is_green) tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/ rs_set_expected_tpt_table(lq_sta, tbl); rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index); IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask); if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n", rate, rate_mask); return -1; } tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green); IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n", tbl->current_rate, is_green); return 0; } /* * Try to switch to new modulation mode from legacy */ static int rs_move_legacy_other(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int index) { 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 iwl_rate_scale_data *window = &(tbl->win[index]); u32 sz = (sizeof(struct iwl_scale_tbl_info) - (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; u8 valid_tx_ant = priv->hw_params.valid_tx_ant; u8 tx_chains_num = priv->hw_params.tx_chains_num; int ret = 0; for (; ;) { switch (tbl->action) { case IWL_LEGACY_SWITCH_ANTENNA1: case IWL_LEGACY_SWITCH_ANTENNA2: IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n"); lq_sta->action_counter++; if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 && tx_chains_num <= 1) || (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 && tx_chains_num <= 2)) break; /* Don't change antenna if success has been great */ if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; /* Set up search table to try other antenna */ memcpy(search_tbl, tbl, sz); if (rs_toggle_antenna(valid_tx_ant, &search_tbl->current_rate, search_tbl)) { rs_set_expected_tpt_table(lq_sta, search_tbl); goto out; } break; case IWL_LEGACY_SWITCH_SISO: IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n"); /* Set up search table to try SISO */ memcpy(search_tbl, tbl, sz); search_tbl->is_SGI = 0; ret = rs_switch_to_siso(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->action_counter = 0; goto out; } break; case IWL_LEGACY_SWITCH_MIMO2_AB: case IWL_LEGACY_SWITCH_MIMO2_AC: case IWL_LEGACY_SWITCH_MIMO2_BC: IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n"); /* Set up search table to try MIMO */ memcpy(search_tbl, tbl, sz); search_tbl->is_SGI = 0; if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB) search_tbl->ant_type = ANT_AB; else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC) search_tbl->ant_type = ANT_AC; else search_tbl->ant_type = ANT_BC; if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) break; ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->action_counter = 0; goto out; } break; } tbl->action++; if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC) tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; if (tbl->action == start_action) break; } search_tbl->lq_type = LQ_NONE; return 0; out: lq_sta->search_better_tbl = 1; tbl->action++; if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC) tbl->action = IWL_LEGACY_SWITCH_ANTENNA1; return 0; } /* * Try to switch to new modulation mode from SISO */ static int rs_move_siso_to_other(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int index) { u8 is_green = lq_sta->is_green; 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 iwl_rate_scale_data *window = &(tbl->win[index]); u32 sz = (sizeof(struct iwl_scale_tbl_info) - (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; u8 valid_tx_ant = priv->hw_params.valid_tx_ant; u8 tx_chains_num = priv->hw_params.tx_chains_num; int ret; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IWL_SISO_SWITCH_ANTENNA1: case IWL_SISO_SWITCH_ANTENNA2: IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n"); if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 && tx_chains_num <= 1) || (tbl->action == IWL_SISO_SWITCH_ANTENNA2 && tx_chains_num <= 2)) break; if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; memcpy(search_tbl, tbl, sz); if (rs_toggle_antenna(valid_tx_ant, &search_tbl->current_rate, search_tbl)) goto out; break; case IWL_SISO_SWITCH_MIMO2_AB: case IWL_SISO_SWITCH_MIMO2_AC: case IWL_SISO_SWITCH_MIMO2_BC: IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n"); memcpy(search_tbl, tbl, sz); search_tbl->is_SGI = 0; if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB) search_tbl->ant_type = ANT_AB; else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC) search_tbl->ant_type = ANT_AC; else search_tbl->ant_type = ANT_BC; if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) break; ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) goto out; break; case IWL_SISO_SWITCH_GI: if (!tbl->is_fat && !(priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ)) break; if (tbl->is_fat && !(priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ)) break; IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n"); memcpy(search_tbl, tbl, sz); if (is_green) { if (!tbl->is_SGI) break; else IWL_ERR(priv, "SGI was set in GF+SISO\n"); } search_tbl->is_SGI = !tbl->is_SGI; rs_set_expected_tpt_table(lq_sta, search_tbl); if (tbl->is_SGI) { s32 tpt = lq_sta->last_tpt / 100; if (tpt >= search_tbl->expected_tpt[index]) break; } search_tbl->current_rate = rate_n_flags_from_tbl(priv, search_tbl, index, is_green); goto out; } tbl->action++; if (tbl->action > IWL_SISO_SWITCH_GI) tbl->action = IWL_SISO_SWITCH_ANTENNA1; if (tbl->action == start_action) break; } search_tbl->lq_type = LQ_NONE; return 0; out: lq_sta->search_better_tbl = 1; tbl->action++; if (tbl->action > IWL_SISO_SWITCH_GI) tbl->action = IWL_SISO_SWITCH_ANTENNA1; return 0; } /* * Try to switch to new modulation mode from MIMO */ static int rs_move_mimo_to_other(struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, struct ieee80211_conf *conf, struct ieee80211_sta *sta, int index) { s8 is_green = lq_sta->is_green; 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 iwl_rate_scale_data *window = &(tbl->win[index]); u32 sz = (sizeof(struct iwl_scale_tbl_info) - (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; u8 valid_tx_ant = priv->hw_params.valid_tx_ant; u8 tx_chains_num = priv->hw_params.tx_chains_num; int ret; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IWL_MIMO2_SWITCH_ANTENNA1: case IWL_MIMO2_SWITCH_ANTENNA2: IWL_DEBUG_RATE(priv, "LQ: MIMO toggle Antennas\n"); if (tx_chains_num <= 2) break; if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; memcpy(search_tbl, tbl, sz); if (rs_toggle_antenna(valid_tx_ant, &search_tbl->current_rate, search_tbl)) goto out; break; case IWL_MIMO2_SWITCH_SISO_A: case IWL_MIMO2_SWITCH_SISO_B: case IWL_MIMO2_SWITCH_SISO_C: IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n"); /* Set up new search table for SISO */ memcpy(search_tbl, tbl, sz); if (tbl->action == IWL_MIMO2_SWITCH_SISO_A) search_tbl->ant_type = ANT_A; else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B) search_tbl->ant_type = ANT_B; else search_tbl->ant_type = ANT_C; if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type)) break; ret = rs_switch_to_siso(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) goto out; break; case IWL_MIMO2_SWITCH_GI: if (!tbl->is_fat && !(priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ)) break; if (tbl->is_fat && !(priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ)) break; IWL_DEBUG_RATE(priv, "LQ: MIMO toggle SGI/NGI\n"); /* Set up new search table for MIMO */ memcpy(search_tbl, tbl, sz); search_tbl->is_SGI = !tbl->is_SGI; rs_set_expected_tpt_table(lq_sta, search_tbl); /* * If active table already uses the fastest possible * modulation (dual stream with short guard interval), * and it's working well, there's no need to look * for a better type of modulation! */ if (tbl->is_SGI) { s32 tpt = lq_sta->last_tpt / 100; if (tpt >= search_tbl->expected_tpt[index]) break; } search_tbl->current_rate = rate_n_flags_from_tbl(priv, search_tbl, index, is_green); goto out; } tbl->action++; if (tbl->action > IWL_MIMO2_SWITCH_GI) tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; if (tbl->action == start_action) break; } search_tbl->lq_type = LQ_NONE; return 0; out: lq_sta->search_better_tbl = 1; tbl->action++; if (tbl->action > IWL_MIMO2_SWITCH_GI) tbl->action = IWL_MIMO2_SWITCH_ANTENNA1; return 0; } /* * 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) { struct iwl_scale_tbl_info *tbl; int i; int active_tbl; int flush_interval_passed = 0; struct iwl_priv *priv; priv = lq_sta->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->stay_in_tbl) { /* Elapsed time using current modulation mode */ if (lq_sta->flush_timer) flush_interval_passed = time_after(jiffies, (unsigned long)(lq_sta->flush_timer + IWL_RATE_SCALE_FLUSH_INTVL)); /* * 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 ((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(priv, "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->stay_in_tbl = 0; /* only place reset */ lq_sta->total_failed = 0; lq_sta->total_success = 0; lq_sta->flush_timer = 0; /* * 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(priv, "LQ: stay in table clear win\n"); for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window( &(tbl->win[i])); } } /* If transitioning to allow "search", reset all history * bitmaps and stats in active table (this will become the new * "search" table). */ if (!lq_sta->stay_in_tbl) { for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(tbl->win[i])); } } } /* * Do rate scaling and search for new modulation mode. */ static void rs_rate_scale_perform(struct iwl_priv *priv, struct ieee80211_hdr *hdr, struct ieee80211_sta *sta, struct iwl_lq_sta *lq_sta) { struct ieee80211_hw *hw = priv->hw; struct ieee80211_conf *conf = &hw->conf; int low = IWL_RATE_INVALID; int high = IWL_RATE_INVALID; int index; int i; 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; s8 scale_action = 0; u16 rate_mask; u8 update_lq = 0; struct iwl_scale_tbl_info *tbl, *tbl1; u16 rate_scale_index_msk = 0; u32 rate; u8 is_green = 0; u8 active_tbl = 0; u8 done_search = 0; u16 high_low; s32 sr; u8 tid = MAX_TID_COUNT; struct iwl_tid_data *tid_data; IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n"); /* Send management frames and broadcast/multicast data using * lowest rate. */ /* TODO: this could probably be improved.. */ if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) return; if (!sta || !lq_sta) return; lq_sta->supp_rates = sta->supp_rates[lq_sta->band]; tid = rs_tl_add_packet(lq_sta, hdr); /* * 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]); is_green = lq_sta->is_green; /* current tx rate */ index = lq_sta->last_txrate_idx; IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index, tbl->lq_type); /* rates available for this association, and for modulation mode */ rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type); IWL_DEBUG_RATE(priv, "mask 0x%04X \n", rate_mask); /* mask with station rate restriction */ if (is_legacy(tbl->lq_type)) { if (lq_sta->band == IEEE80211_BAND_5GHZ) /* supp_rates has no CCK bits in A mode */ rate_scale_index_msk = (u16) (rate_mask & (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE)); else rate_scale_index_msk = (u16) (rate_mask & lq_sta->supp_rates); } else rate_scale_index_msk = rate_mask; if (!rate_scale_index_msk) rate_scale_index_msk = rate_mask; if (!((1 << index) & rate_scale_index_msk)) { IWL_ERR(priv, "Current Rate is not valid\n"); return; } /* Get expected throughput table and history window for current rate */ if (!tbl->expected_tpt) { IWL_ERR(priv, "tbl->expected_tpt is NULL\n"); return; } /* force user max rate if set by user */ if ((lq_sta->max_rate_idx != -1) && (lq_sta->max_rate_idx < index)) { index = lq_sta->max_rate_idx; update_lq = 1; window = &(tbl->win[index]); goto lq_update; } 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_RATE_MIN_FAILURE_TH) && (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) { IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d " "for index %d\n", window->success_counter, window->counter, index); /* 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); goto out; } /* Else we have enough samples; calculate estimate of * actual average throughput */ BUG_ON(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(priv, "LQ: SWITCHING TO NEW TABLE " "suc=%d cur-tpt=%d old-tpt=%d\n", window->success_ratio, window->average_tpt, lq_sta->last_tpt); if (!is_legacy(tbl->lq_type)) lq_sta->enable_counter = 1; /* 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(priv, "LQ: GOING BACK TO THE OLD TABLE " "suc=%d cur-tpt=%d old-tpt=%d\n", window->success_ratio, window->average_tpt, lq_sta->last_tpt); /* Nullify "search" table */ tbl->lq_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 = iwl_hwrate_to_plcp_idx(tbl->current_rate); 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(priv, index, rate_scale_index_msk, tbl->lq_type); low = high_low & 0xff; high = (high_low >> 8) & 0xff; /* If user set max rate, dont allow higher than user constrain */ if ((lq_sta->max_rate_idx != -1) && (lq_sta->max_rate_idx < high)) high = IWL_RATE_INVALID; 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; scale_action = 0; /* Too many failures, decrease rate */ if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); scale_action = -1; /* No throughput measured yet for adjacent rates; try increase. */ } else if ((low_tpt == IWL_INVALID_VALUE) && (high_tpt == IWL_INVALID_VALUE)) { if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) scale_action = 1; else if (low != IWL_RATE_INVALID) scale_action = 0; } /* Both adjacent throughputs are measured, but neither one has better * throughput; we're using the best rate, don't change it! */ else if ((low_tpt != IWL_INVALID_VALUE) && (high_tpt != IWL_INVALID_VALUE) && (low_tpt < current_tpt) && (high_tpt < current_tpt)) scale_action = 0; /* At least one adjacent rate's throughput is measured, * and may have better performance. */ else { /* Higher adjacent rate's throughput is measured */ if (high_tpt != IWL_INVALID_VALUE) { /* Higher rate has better throughput */ if (high_tpt > current_tpt && sr >= IWL_RATE_INCREASE_TH) { scale_action = 1; } else { scale_action = 0; } /* Lower adjacent rate's throughput is measured */ } else if (low_tpt != IWL_INVALID_VALUE) { /* Lower rate has better throughput */ if (low_tpt > current_tpt) { IWL_DEBUG_RATE(priv, "decrease rate because of low tpt\n"); scale_action = -1; } else if (sr >= IWL_RATE_INCREASE_TH) { scale_action = 1; } } } /* Sanity check; asked for decrease, but success rate or throughput * has been good at old rate. Don't change it. */ if ((scale_action == -1) && (low != IWL_RATE_INVALID) && ((sr > IWL_RATE_HIGH_TH) || (current_tpt > (100 * tbl->expected_tpt[low])))) scale_action = 0; switch (scale_action) { case -1: /* Decrease starting rate, update uCode's rate table */ if (low != IWL_RATE_INVALID) { update_lq = 1; index = low; } break; case 1: /* Increase starting rate, update uCode's rate table */ if (high != IWL_RATE_INVALID) { update_lq = 1; index = high; } break; case 0: /* No change */ default: break; } IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d " "high %d type %d\n", index, scale_action, low, high, tbl->lq_type); lq_update: /* Replace uCode's rate table for the destination station. */ if (update_lq) { rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); rs_fill_link_cmd(priv, lq_sta, rate); iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); } /* Should we stay with this modulation mode, or search for a new one? */ rs_stay_in_table(lq_sta); /* * 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->stay_in_tbl && window->counter) { /* Save current throughput to compare with "search" throughput*/ lq_sta->last_tpt = current_tpt; /* Select a new "search" modulation mode to try. * If one is found, set up the new "search" table. */ if (is_legacy(tbl->lq_type)) rs_move_legacy_other(priv, lq_sta, conf, sta, index); else if (is_siso(tbl->lq_type)) rs_move_siso_to_other(priv, lq_sta, conf, sta, index); else rs_move_mimo_to_other(priv, lq_sta, conf, sta, index); /* 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)]); for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(tbl->win[i])); /* Use new "search" start rate */ index = iwl_hwrate_to_plcp_idx(tbl->current_rate); IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n", tbl->current_rate, index); rs_fill_link_cmd(priv, lq_sta, tbl->current_rate); iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); } /* 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->lq_type) && !conf_is_ht(conf) && lq_sta->action_counter >= 1) { lq_sta->action_counter = 0; IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n"); rs_set_stay_in_table(priv, 1, lq_sta); } /* 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->enable_counter && (lq_sta->action_counter >= IWL_ACTION_LIMIT)) { if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && (lq_sta->tx_agg_tid_en & (1 << tid)) && (tid != MAX_TID_COUNT)) { tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid]; if (tid_data->agg.state == IWL_AGG_OFF) { IWL_DEBUG_RATE(priv, "try to aggregate tid %d\n", tid); rs_tl_turn_on_agg(priv, tid, lq_sta, sta); } } lq_sta->action_counter = 0; rs_set_stay_in_table(priv, 0, lq_sta); } /* * Else, don't search for a new modulation mode. * Put new timestamp in stay-in-modulation-mode flush timer if: * 1) Not changing rates right now * 2) Not just finishing up a search * 3) flush timer is empty */ } else { if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer)) lq_sta->flush_timer = jiffies; } out: tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green); i = index; lq_sta->last_txrate_idx = i; return; } static void rs_initialize_lq(struct iwl_priv *priv, struct ieee80211_conf *conf, struct ieee80211_sta *sta, struct iwl_lq_sta *lq_sta) { struct iwl_scale_tbl_info *tbl; int rate_idx; int i; u32 rate; u8 use_green = rs_use_green(priv, conf); u8 active_tbl = 0; u8 valid_tx_ant; if (!sta || !lq_sta) goto out; i = lq_sta->last_txrate_idx; if ((lq_sta->lq.sta_id == 0xff) && (priv->iw_mode == NL80211_IFTYPE_ADHOC)) goto out; valid_tx_ant = priv->hw_params.valid_tx_ant; 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]); if ((i < 0) || (i >= IWL_RATE_COUNT)) i = 0; rate = iwl_rates[i].plcp; tbl->ant_type = first_antenna(valid_tx_ant); rate |= tbl->ant_type << RATE_MCS_ANT_POS; if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) rate |= RATE_MCS_CCK_MSK; rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx); if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type)) rs_toggle_antenna(valid_tx_ant, &rate, tbl); rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green); tbl->current_rate = rate; rs_set_expected_tpt_table(lq_sta, tbl); rs_fill_link_cmd(NULL, lq_sta, rate); iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); out: return; } static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta, struct ieee80211_tx_rate_control *txrc) { struct sk_buff *skb = txrc->skb; struct ieee80211_supported_band *sband = txrc->sband; struct iwl_priv *priv = (struct iwl_priv *)priv_r; struct ieee80211_conf *conf = &priv->hw->conf; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_lq_sta *lq_sta = priv_sta; int rate_idx; u64 mask_bit = 0; IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n"); /* Get max rate if user set max rate */ if (lq_sta) { lq_sta->max_rate_idx = txrc->max_rate_idx; if ((sband->band == IEEE80211_BAND_5GHZ) && (lq_sta->max_rate_idx != -1)) lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE; if ((lq_sta->max_rate_idx < 0) || (lq_sta->max_rate_idx >= IWL_RATE_COUNT)) lq_sta->max_rate_idx = -1; } if (sta) mask_bit = sta->supp_rates[sband->band]; /* Send management frames and broadcast/multicast data using lowest * rate. */ if (!ieee80211_is_data(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1) || !sta || !lq_sta) { if (!mask_bit) info->control.rates[0].idx = rate_lowest_index(sband, NULL); else info->control.rates[0].idx = rate_lowest_index(sband, sta); return; } rate_idx = lq_sta->last_txrate_idx; if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && !lq_sta->ibss_sta_added) { u8 sta_id = iwl_find_station(priv, hdr->addr1); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", hdr->addr1); sta_id = iwl_add_station_flags(priv, hdr->addr1, 0, CMD_ASYNC, NULL); } if ((sta_id != IWL_INVALID_STATION)) { lq_sta->lq.sta_id = sta_id; lq_sta->lq.rs_table[0].rate_n_flags = 0; lq_sta->ibss_sta_added = 1; rs_initialize_lq(priv, conf, sta, lq_sta); } } if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT) rate_idx = rate_lowest_index(sband, sta); else if (sband->band == IEEE80211_BAND_5GHZ) rate_idx -= IWL_FIRST_OFDM_RATE; info->control.rates[0].idx = rate_idx; } static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta, gfp_t gfp) { struct iwl_lq_sta *lq_sta; struct iwl_priv *priv; int i, j; priv = (struct iwl_priv *)priv_rate; IWL_DEBUG_RATE(priv, "create station rate scale window\n"); lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp); if (lq_sta == NULL) return NULL; lq_sta->lq.sta_id = 0xff; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); return lq_sta; } static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta) { int i, j; struct iwl_priv *priv = (struct iwl_priv *)priv_r; struct ieee80211_conf *conf = &priv->hw->conf; struct iwl_lq_sta *lq_sta = priv_sta; u16 mask_bit = 0; int count; int start_rate = 0; lq_sta->flush_timer = 0; lq_sta->supp_rates = sta->supp_rates[sband->band]; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]); IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init ***\n"); /* 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->ibss_sta_added = 0; if (priv->iw_mode == NL80211_IFTYPE_AP) { u8 sta_id = iwl_find_station(priv, sta->addr); /* for IBSS the call are from tasklet */ IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", sta->addr); sta_id = iwl_add_station_flags(priv, sta->addr, 0, CMD_ASYNC, NULL); } if ((sta_id != IWL_INVALID_STATION)) { lq_sta->lq.sta_id = sta_id; lq_sta->lq.rs_table[0].rate_n_flags = 0; } /* FIXME: this is w/a remove it later */ priv->assoc_station_added = 1; } lq_sta->is_dup = 0; lq_sta->max_rate_idx = -1; lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX; lq_sta->is_green = rs_use_green(priv, conf); lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000); lq_sta->active_rate_basic = priv->active_rate_basic; lq_sta->band = priv->band; /* * 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 = sta->ht_cap.mcs.rx_mask[0] << 1; lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1; lq_sta->active_siso_rate &= ~((u16)0x2); lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; /* Same here */ lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1; lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1; lq_sta->active_mimo2_rate &= ~((u16)0x2); lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1; lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1; lq_sta->active_mimo3_rate &= ~((u16)0x2); lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE; IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n", lq_sta->active_siso_rate, lq_sta->active_mimo2_rate, lq_sta->active_mimo3_rate); /* These values will be overridden later */ lq_sta->lq.general_params.single_stream_ant_msk = ANT_A; lq_sta->lq.general_params.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->drv = priv; /* Find highest tx rate supported by hardware and destination station */ mask_bit = sta->supp_rates[sband->band]; count = sband->n_bitrates; if (sband->band == IEEE80211_BAND_5GHZ) { count += IWL_FIRST_OFDM_RATE; start_rate = IWL_FIRST_OFDM_RATE; mask_bit <<= IWL_FIRST_OFDM_RATE; } mask_bit = mask_bit & lq_sta->active_legacy_rate; lq_sta->last_txrate_idx = 4; for (i = start_rate; i < count; i++) if (mask_bit & BIT(i)) lq_sta->last_txrate_idx = i; rs_initialize_lq(priv, conf, sta, lq_sta); } static void rs_fill_link_cmd(const struct iwl_priv *priv, struct iwl_lq_sta *lq_sta, u32 new_rate) { struct iwl_scale_tbl_info tbl_type; int index = 0; int rate_idx; int repeat_rate = 0; u8 ant_toggle_cnt = 0; u8 use_ht_possible = 1; u8 valid_tx_ant = 0; struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq; /* Override starting rate (index 0) if needed for debug purposes */ rs_dbgfs_set_mcs(lq_sta, &new_rate, index); /* Interpret new_rate (rate_n_flags) */ memset(&tbl_type, 0, sizeof(tbl_type)); rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, &rate_idx); /* How many times should we repeat the initial rate? */ if (is_legacy(tbl_type.lq_type)) { ant_toggle_cnt = 1; repeat_rate = IWL_NUMBER_TRY; } else { repeat_rate = IWL_HT_NUMBER_TRY; } lq_cmd->general_params.mimo_delimiter = is_mimo(tbl_type.lq_type) ? 1 : 0; /* Fill 1st table entry (index 0) */ lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); if (num_of_ant(tbl_type.ant_type) == 1) { lq_cmd->general_params.single_stream_ant_msk = tbl_type.ant_type; } else if (num_of_ant(tbl_type.ant_type) == 2) { lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type; } /* otherwise we don't modify the existing value */ index++; repeat_rate--; if (priv) valid_tx_ant = priv->hw_params.valid_tx_ant; /* Fill rest of rate table */ while (index < LINK_QUAL_MAX_RETRY_NUM) { /* Repeat initial/next rate. * For legacy IWL_NUMBER_TRY == 1, this loop will not execute. * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */ while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) { if (is_legacy(tbl_type.lq_type)) { if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) ant_toggle_cnt++; else if (priv && rs_toggle_antenna(valid_tx_ant, &new_rate, &tbl_type)) ant_toggle_cnt = 1; } /* Override next rate if needed for debug purposes */ rs_dbgfs_set_mcs(lq_sta, &new_rate, index); /* Fill next table entry */ lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); repeat_rate--; index++; } rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type, &rate_idx); /* Indicate to uCode which entries might be MIMO. * If initial rate was MIMO, this will finally end up * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */ if (is_mimo(tbl_type.lq_type)) lq_cmd->general_params.mimo_delimiter = index; /* Get next rate */ new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, use_ht_possible); /* How many times should we repeat the next rate? */ if (is_legacy(tbl_type.lq_type)) { if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE) ant_toggle_cnt++; else if (priv && rs_toggle_antenna(valid_tx_ant, &new_rate, &tbl_type)) ant_toggle_cnt = 1; repeat_rate = IWL_NUMBER_TRY; } else { repeat_rate = IWL_HT_NUMBER_TRY; } /* Don't allow HT rates after next pass. * rs_get_lower_rate() will change type to LQ_A or LQ_G. */ use_ht_possible = 0; /* Override next rate if needed for debug purposes */ rs_dbgfs_set_mcs(lq_sta, &new_rate, index); /* Fill next table entry */ lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate); index++; repeat_rate--; } lq_cmd->agg_params.agg_frame_cnt_limit = 64; lq_cmd->agg_params.agg_dis_start_th = 3; lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000); } 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 *priv_rate) { return; } static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta, void *priv_sta) { struct iwl_lq_sta *lq_sta = priv_sta; struct iwl_priv *priv __maybe_unused = priv_r; IWL_DEBUG_RATE(priv, "enter\n"); kfree(lq_sta); IWL_DEBUG_RATE(priv, "leave\n"); } #ifdef CONFIG_MAC80211_DEBUGFS static int open_file_generic(struct inode *inode, struct file *file) { file->private_data = inode->i_private; return 0; } static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta, u32 *rate_n_flags, int index) { struct iwl_priv *priv; priv = lq_sta->drv; if (lq_sta->dbg_fixed_rate) { if (index < 12) { *rate_n_flags = lq_sta->dbg_fixed_rate; } else { if (lq_sta->band == IEEE80211_BAND_5GHZ) *rate_n_flags = 0x800D; else *rate_n_flags = 0x820A; } IWL_DEBUG_RATE(priv, "Fixed rate ON\n"); } else { IWL_DEBUG_RATE(priv, "Fixed rate OFF\n"); } } 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_priv *priv; char buf[64]; int buf_size; u32 parsed_rate; priv = lq_sta->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->dbg_fixed_rate = parsed_rate; else lq_sta->dbg_fixed_rate = 0; 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 */ lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n", lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate); if (lq_sta->dbg_fixed_rate) { rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate); iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC); } 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_priv *priv; struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); priv = lq_sta->drv; buff = kmalloc(1024, 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%X\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->dbg_fixed_rate); desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "", (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "", (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : ""); desc += sprintf(buff+desc, "lq type %s\n", (is_legacy(tbl->lq_type)) ? "legacy" : "HT"); if (is_Ht(tbl->lq_type)) { desc += sprintf(buff+desc, " %s", (is_siso(tbl->lq_type)) ? "SISO" : ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3")); desc += sprintf(buff+desc, " %s", (tbl->is_fat) ? "40MHz" : "20MHz"); desc += sprintf(buff+desc, " %s\n", (tbl->is_SGI) ? "SGI" : ""); } desc += sprintf(buff+desc, "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", lq_sta->lq.general_params.flags, lq_sta->lq.general_params.mimo_delimiter, lq_sta->lq.general_params.single_stream_ant_msk, lq_sta->lq.general_params.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_params.agg_time_limit), lq_sta->lq.agg_params.agg_dis_start_th, lq_sta->lq.agg_params.agg_frame_cnt_limit); desc += sprintf(buff+desc, "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", lq_sta->lq.general_params.start_rate_index[0], lq_sta->lq.general_params.start_rate_index[1], lq_sta->lq.general_params.start_rate_index[2], lq_sta->lq.general_params.start_rate_index[3]); for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) desc += sprintf(buff+desc, " rate[%d] 0x%X\n", i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags)); 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 = open_file_generic, }; 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_lq_sta *lq_sta = file->private_data; buff = kmalloc(1024, GFP_KERNEL); if (!buff) return -ENOMEM; for (i = 0; i < LQ_SIZE; i++) { desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n" "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x", lq_sta->lq_info[i].lq_type, lq_sta->lq_info[i].is_SGI, lq_sta->lq_info[i].is_fat, lq_sta->lq_info[i].is_dup, lq_sta->lq_info[i].current_rate); for (j = 0; j < IWL_RATE_COUNT; j++) { desc += sprintf(buff+desc, "counter=%d success=%d %%=%d\n", lq_sta->lq_info[i].win[j].counter, lq_sta->lq_info[i].win[j].success_counter, lq_sta->lq_info[i].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 = open_file_generic, }; static void rs_add_debugfs(void *priv, void *priv_sta, struct dentry *dir) { struct iwl_lq_sta *lq_sta = priv_sta; lq_sta->rs_sta_dbgfs_scale_table_file = debugfs_create_file("rate_scale_table", 0600, dir, lq_sta, &rs_sta_dbgfs_scale_table_ops); lq_sta->rs_sta_dbgfs_stats_table_file = debugfs_create_file("rate_stats_table", 0600, dir, lq_sta, &rs_sta_dbgfs_stats_table_ops); lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file = debugfs_create_u8("tx_agg_tid_enable", 0600, dir, &lq_sta->tx_agg_tid_en); } static void rs_remove_debugfs(void *priv, void *priv_sta) { struct iwl_lq_sta *lq_sta = priv_sta; debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file); debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); } #endif static struct rate_control_ops rs_ops = { .module = NULL, .name = RS_NAME, .tx_status = rs_tx_status, .get_rate = rs_get_rate, .rate_init = rs_rate_init, .alloc = rs_alloc, .free = rs_free, .alloc_sta = rs_alloc_sta, .free_sta = rs_free_sta, #ifdef CONFIG_MAC80211_DEBUGFS .add_sta_debugfs = rs_add_debugfs, .remove_sta_debugfs = rs_remove_debugfs, #endif }; int iwlagn_rate_control_register(void) { return ieee80211_rate_control_register(&rs_ops); } void iwlagn_rate_control_unregister(void) { ieee80211_rate_control_unregister(&rs_ops); }