/****************************************************************************** * * Copyright(c) 2005 - 2008 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: * James P. Ketrenos * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include "../net/mac80211/rate.h" #include "iwl-4965.h" #include "iwl-core.h" #include "iwl-helpers.h" #define RS_NAME "iwl-4965-rs" #define NUM_TRY_BEFORE_ANTENNA_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 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 }; struct iwl4965_rate { u32 rate_n_flags; } __attribute__ ((packed)); /** * struct iwl4965_rate_scale_data -- tx success history for one rate */ struct iwl4965_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 iwl4965_scale_tbl_info -- tx params and success history for all rates * * There are two of these in struct iwl4965_lq_sta, * one for "active", and one for "search". */ struct iwl4965_scale_tbl_info { enum iwl4965_table_type lq_type; enum iwl4965_antenna_type antenna_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. */ struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */ struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */ }; #ifdef CONFIG_IWL4965_HT struct iwl4965_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 */ }; #endif /* CONFIG_IWL4965_HT */ /** * struct iwl4965_lq_sta -- driver's rate scaling private structure * * Pointer to this gets passed back and forth between driver and mac80211. */ struct iwl4965_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 antenna; u8 valid_antenna; 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_rate; u16 active_siso_rate; u16 active_mimo_rate; u16 active_rate_basic; struct iwl_link_quality_cmd lq; struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */ #ifdef CONFIG_IWL4965_HT struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT]; u8 tx_agg_tid_en; #endif #ifdef CONFIG_MAC80211_DEBUGFS struct dentry *rs_sta_dbgfs_scale_table_file; struct dentry *rs_sta_dbgfs_stats_table_file; #ifdef CONFIG_IWL4965_HT struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file; #endif struct iwl4965_rate dbg_fixed; #endif struct iwl_priv *drv; }; static void rs_rate_scale_perform(struct iwl_priv *priv, struct net_device *dev, struct ieee80211_hdr *hdr, struct sta_info *sta); static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta, struct iwl4965_rate *tx_mcs, struct iwl_link_quality_cmd *tbl); #ifdef CONFIG_MAC80211_DEBUGFS static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta, struct iwl4965_rate *mcs, int index); #else static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta, struct iwl4965_rate *mcs, 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). */ 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 iwl4965_rate_get_rate(u32 rate_n_flags) { return (u8)(rate_n_flags & 0xFF); } static void rs_rate_scale_clear_window(struct iwl4965_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; } #ifdef CONFIG_IWL4965_HT /* * 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 iwl4965_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 void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 index; struct iwl4965_traffic_load *tl = NULL; if (tid >= TID_MAX_LOAD_COUNT) return; 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; } 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; } /* get the traffic load value for tid */ static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid) { u32 curr_time = jiffies_to_msecs(jiffies); u32 time_diff; s32 index; struct iwl4965_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 iwl4965_lq_sta *lq_data, u8 tid, struct sta_info *sta) { unsigned long state; DECLARE_MAC_BUF(mac); spin_lock_bh(&sta->ampdu_mlme.ampdu_tx); state = sta->ampdu_mlme.tid_state_tx[tid]; spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx); if (state == HT_AGG_STATE_IDLE && rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) { IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n", print_mac(mac, 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 iwl4965_lq_sta *lq_data, struct sta_info *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); } #endif /* CONFIG_IWLWIFI_HT */ /** * 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 iwl4965_rate_scale_data *windows, int scale_index, s32 tpt, int retries, int successes) { struct iwl4965_rate_scale_data *window = NULL; u64 mask; u8 win_size = IWL_RATE_MAX_WINDOW; 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 >= win_size) { window->counter = win_size - 1; mask = 1; mask = (mask << (win_size - 1)); if (window->data & mask) { window->data &= ~mask; window->success_counter = window->success_counter - 1; } } /* 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. */ mask = window->data; window->data = (mask << 1); if (successes > 0) { window->success_counter = window->success_counter + 1; 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. */ static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate, struct iwl4965_scale_tbl_info *tbl, int index, u8 use_green) { if (is_legacy(tbl->lq_type)) { mcs_rate->rate_n_flags = iwl4965_rates[index].plcp; if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK; } else if (is_siso(tbl->lq_type)) { if (index > IWL_LAST_OFDM_RATE) index = IWL_LAST_OFDM_RATE; mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso | RATE_MCS_HT_MSK; } else { if (index > IWL_LAST_OFDM_RATE) index = IWL_LAST_OFDM_RATE; mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo | RATE_MCS_HT_MSK; } switch (tbl->antenna_type) { case ANT_BOTH: mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK; break; case ANT_MAIN: mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK; break; case ANT_AUX: mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK; break; case ANT_NONE: break; } if (is_legacy(tbl->lq_type)) return; if (tbl->is_fat) { if (tbl->is_dup) mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK; else mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK; } if (tbl->is_SGI) mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK; if (use_green) { mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK; if (is_siso(tbl->lq_type)) mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK; } } /* * Interpret uCode API's rate_n_flags format, * fill "search" or "active" tx mode table. */ static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate, enum ieee80211_band band, struct iwl4965_scale_tbl_info *tbl, int *rate_idx) { int index; u32 ant_msk; index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags); if (index == IWL_RATE_INVALID) { *rate_idx = -1; return -EINVAL; } tbl->is_SGI = 0; /* default legacy setup */ tbl->is_fat = 0; tbl->is_dup = 0; tbl->antenna_type = ANT_BOTH; /* default MIMO setup */ /* legacy rate format */ if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) { ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK); if (ant_msk == RATE_MCS_ANT_AB_MSK) tbl->lq_type = LQ_NONE; else { if (band == IEEE80211_BAND_5GHZ) tbl->lq_type = LQ_A; else tbl->lq_type = LQ_G; if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK) tbl->antenna_type = ANT_MAIN; else tbl->antenna_type = ANT_AUX; } *rate_idx = index; /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */ } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags) <= IWL_RATE_SISO_60M_PLCP) { tbl->lq_type = LQ_SISO; ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK); if (ant_msk == RATE_MCS_ANT_AB_MSK) tbl->lq_type = LQ_NONE; else { if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK) tbl->antenna_type = ANT_MAIN; else tbl->antenna_type = ANT_AUX; } if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK) tbl->is_SGI = 1; if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) || (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)) tbl->is_fat = 1; if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK) tbl->is_dup = 1; *rate_idx = index; /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */ } else { tbl->lq_type = LQ_MIMO; if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK) tbl->is_SGI = 1; if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) || (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)) tbl->is_fat = 1; if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK) tbl->is_dup = 1; *rate_idx = index; } return 0; } static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate, struct iwl4965_scale_tbl_info *tbl) { if (tbl->antenna_type == ANT_AUX) { tbl->antenna_type = ANT_MAIN; new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK; new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK; } else { tbl->antenna_type = ANT_AUX; new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK; new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK; } } static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf) { #ifdef CONFIG_IWL4965_HT return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) && priv->current_ht_config.is_green_field && !priv->current_ht_config.non_GF_STA_present); #endif /* CONFIG_IWL4965_HT */ return 0; } /** * rs_get_supported_rates - get the available rates * * if management frame or broadcast frame only return * basic available rates. * */ static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta, struct ieee80211_hdr *hdr, enum iwl4965_table_type rate_type, u16 *data_rate) { if (is_legacy(rate_type)) *data_rate = lq_sta->active_rate; else { if (is_siso(rate_type)) *data_rate = lq_sta->active_siso_rate; else *data_rate = lq_sta->active_mimo_rate; } if (hdr && is_multicast_ether_addr(hdr->addr1) && lq_sta->active_rate_basic) { *data_rate = lq_sta->active_rate_basic; } } static u16 rs_get_adjacent_rate(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 = iwl4965_rates[low].prev_rs; if (low == IWL_RATE_INVALID) break; if (rate_mask & (1 << low)) break; IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); } high = index; while (high != IWL_RATE_INVALID) { high = iwl4965_rates[high].next_rs; if (high == IWL_RATE_INVALID) break; if (rate_mask & (1 << high)) break; IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); } return (high << 8) | low; } static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta, struct iwl4965_scale_tbl_info *tbl, u8 scale_index, u8 ht_possible, struct iwl4965_rate *mcs_rate) { 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 ((tbl->antenna_type == ANT_BOTH) || (tbl->antenna_type == ANT_NONE)) tbl->antenna_type = ANT_MAIN; tbl->is_fat = 0; tbl->is_SGI = 0; } rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask); /* 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))) { rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green); return; } high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type); low = high_low & 0xff; if (low != IWL_RATE_INVALID) rs_mcs_from_tbl(mcs_rate, tbl, low, is_green); else rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green); } /* * mac80211 sends us Tx status */ static void rs_tx_status(void *priv_rate, struct net_device *dev, struct sk_buff *skb, struct ieee80211_tx_status *tx_resp) { int status; u8 retries; int rs_index, index = 0; struct iwl4965_lq_sta *lq_sta; struct iwl_link_quality_cmd *table; struct sta_info *sta; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct iwl_priv *priv = (struct iwl_priv *)priv_rate; struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_hw *hw = local_to_hw(local); struct iwl4965_rate_scale_data *window = NULL; struct iwl4965_rate_scale_data *search_win = NULL; struct iwl4965_rate tx_mcs; struct iwl4965_scale_tbl_info tbl_type; struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl; u8 active_index = 0; u16 fc = le16_to_cpu(hdr->frame_control); s32 tpt = 0; IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n"); if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) return; /* This packet was aggregated but doesn't carry rate scale info */ if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) && !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU)) return; retries = tx_resp->retry_count; if (retries > 15) retries = 15; rcu_read_lock(); sta = sta_info_get(local, hdr->addr1); if (!sta || !sta->rate_ctrl_priv) goto out; lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; if (!priv->lq_mngr.lq_ready) goto out; if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq_sta->ibss_sta_added) goto out; table = &lq_sta->lq; active_index = lq_sta->active_tbl; /* Get mac80211 antenna info */ lq_sta->antenna = (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx); if (!lq_sta->antenna) lq_sta->antenna = lq_sta->valid_antenna; /* Ignore mac80211 antenna info for now */ lq_sta->antenna = lq_sta->valid_antenna; curr_tbl = &(lq_sta->lq_info[active_index]); search_tbl = &(lq_sta->lq_info[(1 - active_index)]); window = (struct iwl4965_rate_scale_data *) &(curr_tbl->win[0]); search_win = (struct iwl4965_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_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags); rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index); if (priv->band == IEEE80211_BAND_5GHZ) rs_index -= IWL_FIRST_OFDM_RATE; if ((tx_resp->control.tx_rate == NULL) || (tbl_type.is_SGI ^ !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) || (tbl_type.is_fat ^ !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) || (tbl_type.is_dup ^ !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) || (tbl_type.antenna_type ^ tx_resp->control.antenna_sel_tx) || (!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^ !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) || (!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^ !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) || (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate != tx_resp->control.tx_rate->bitrate)) { IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_mcs.rate_n_flags); goto out; } /* 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_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(&tx_mcs, 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.antenna_type == search_tbl->antenna_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.antenna_type == curr_tbl->antenna_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_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index); /* Update frame history window with "success" if Tx got ACKed ... */ if (tx_resp->flags & IEEE80211_TX_STATUS_ACK) status = 1; else status = 0; /* If type matches "search" table, * add final tx status to "search" history */ if ((tbl_type.lq_type == search_tbl->lq_type) && (tbl_type.antenna_type == search_tbl->antenna_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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) rs_collect_tx_data(search_win, rs_index, tpt, tx_resp->ampdu_ack_len, tx_resp->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.antenna_type == curr_tbl->antenna_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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) rs_collect_tx_data(window, rs_index, tpt, tx_resp->ampdu_ack_len, tx_resp->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 (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) { lq_sta->total_success += tx_resp->ampdu_ack_map; lq_sta->total_failed += (tx_resp->ampdu_ack_len - tx_resp->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. */ rs_rate_scale_perform(priv, dev, hdr, sta); out: rcu_read_unlock(); return; } static u8 rs_is_ant_connected(u8 valid_antenna, enum iwl4965_antenna_type antenna_type) { if (antenna_type == ANT_AUX) return ((valid_antenna & 0x2) ? 1:0); else if (antenna_type == ANT_MAIN) return ((valid_antenna & 0x1) ? 1:0); else if (antenna_type == ANT_BOTH) return ((valid_antenna & 0x3) == 0x3); return 1; } static u8 rs_is_other_ant_connected(u8 valid_antenna, enum iwl4965_antenna_type antenna_type) { if (antenna_type == ANT_AUX) return rs_is_ant_connected(valid_antenna, ANT_MAIN); else return rs_is_ant_connected(valid_antenna, ANT_AUX); return 0; } /* * 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(u8 is_legacy, struct iwl4965_lq_sta *lq_sta) { IWL_DEBUG_HT("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_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta, struct iwl4965_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)) { 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; } #ifdef CONFIG_IWL4965_HT /* * 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 iwl4965_lq_sta *lq_sta, struct iwl4965_scale_tbl_info *tbl, /* "search" */ u16 rate_mask, s8 index, s8 rate) { /* "active" values */ struct iwl4965_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; new_rate = high = low = start_hi = IWL_RATE_INVALID; for (; ;) { high_low = rs_get_adjacent_rate(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; } #endif /* CONFIG_IWL4965_HT */ static inline u8 rs_is_both_ant_supp(u8 valid_antenna) { return (rs_is_ant_connected(valid_antenna, ANT_BOTH)); } /* * Set up search table for MIMO */ static int rs_switch_to_mimo(struct iwl_priv *priv, struct iwl4965_lq_sta *lq_sta, struct ieee80211_conf *conf, struct sta_info *sta, struct iwl4965_scale_tbl_info *tbl, int index) { #ifdef CONFIG_IWL4965_HT u16 rate_mask; s32 rate; s8 is_green = lq_sta->is_green; if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || !sta->ht_info.ht_supported) return -1; IWL_DEBUG_HT("LQ: try to switch to MIMO\n"); tbl->lq_type = LQ_MIMO; rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask); if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC) return -1; /* Need both Tx chains/antennas to support MIMO */ if (!rs_is_both_ant_supp(lq_sta->antenna)) return -1; tbl->is_dup = lq_sta->is_dup; tbl->action = 0; if (priv->current_ht_config.supported_chan_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; 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_get_expected_tpt_table(lq_sta, tbl); rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index); IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask); if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) return -1; rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green); IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n", tbl->current_rate.rate_n_flags, is_green); return 0; #else return -1; #endif /*CONFIG_IWL4965_HT */ } /* * Set up search table for SISO */ static int rs_switch_to_siso(struct iwl_priv *priv, struct iwl4965_lq_sta *lq_sta, struct ieee80211_conf *conf, struct sta_info *sta, struct iwl4965_scale_tbl_info *tbl, int index) { #ifdef CONFIG_IWL4965_HT u16 rate_mask; u8 is_green = lq_sta->is_green; s32 rate; IWL_DEBUG_HT("LQ: try to switch to SISO\n"); if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) || !sta->ht_info.ht_supported) return -1; tbl->is_dup = lq_sta->is_dup; tbl->lq_type = LQ_SISO; tbl->action = 0; rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask); if (priv->current_ht_config.supported_chan_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; 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; rs_get_expected_tpt_table(lq_sta, tbl); rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index); IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask); if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) { IWL_DEBUG_HT("can not switch with index %d rate mask %x\n", rate, rate_mask); return -1; } rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green); IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n", tbl->current_rate.rate_n_flags, is_green); return 0; #else return -1; #endif /*CONFIG_IWL4965_HT */ } /* * Try to switch to new modulation mode from legacy */ static int rs_move_legacy_other(struct iwl_priv *priv, struct iwl4965_lq_sta *lq_sta, struct ieee80211_conf *conf, struct sta_info *sta, int index) { int ret = 0; struct iwl4965_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct iwl4965_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); struct iwl4965_rate_scale_data *window = &(tbl->win[index]); u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; for (; ;) { switch (tbl->action) { case IWL_LEGACY_SWITCH_ANTENNA: IWL_DEBUG_HT("LQ Legacy switch Antenna\n"); search_tbl->lq_type = LQ_NONE; lq_sta->action_counter++; /* Don't change antenna if success has been great */ if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; /* Don't change antenna if other one is not connected */ if (!rs_is_other_ant_connected(lq_sta->antenna, tbl->antenna_type)) break; /* Set up search table to try other antenna */ memcpy(search_tbl, tbl, sz); rs_toggle_antenna(&(search_tbl->current_rate), search_tbl); rs_get_expected_tpt_table(lq_sta, search_tbl); lq_sta->search_better_tbl = 1; goto out; case IWL_LEGACY_SWITCH_SISO: IWL_DEBUG_HT("LQ: Legacy switch to SISO\n"); /* Set up search table to try SISO */ memcpy(search_tbl, tbl, sz); search_tbl->lq_type = LQ_SISO; search_tbl->is_SGI = 0; search_tbl->is_fat = 0; ret = rs_switch_to_siso(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->search_better_tbl = 1; lq_sta->action_counter = 0; goto out; } break; case IWL_LEGACY_SWITCH_MIMO: IWL_DEBUG_HT("LQ: Legacy switch MIMO\n"); /* Set up search table to try MIMO */ memcpy(search_tbl, tbl, sz); search_tbl->lq_type = LQ_MIMO; search_tbl->is_SGI = 0; search_tbl->is_fat = 0; search_tbl->antenna_type = ANT_BOTH; ret = rs_switch_to_mimo(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->search_better_tbl = 1; lq_sta->action_counter = 0; goto out; } break; } tbl->action++; if (tbl->action > IWL_LEGACY_SWITCH_MIMO) tbl->action = IWL_LEGACY_SWITCH_ANTENNA; if (tbl->action == start_action) break; } return 0; out: tbl->action++; if (tbl->action > IWL_LEGACY_SWITCH_MIMO) tbl->action = IWL_LEGACY_SWITCH_ANTENNA; return 0; } /* * Try to switch to new modulation mode from SISO */ static int rs_move_siso_to_other(struct iwl_priv *priv, struct iwl4965_lq_sta *lq_sta, struct ieee80211_conf *conf, struct sta_info *sta, int index) { int ret; u8 is_green = lq_sta->is_green; struct iwl4965_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct iwl4965_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); struct iwl4965_rate_scale_data *window = &(tbl->win[index]); u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IWL_SISO_SWITCH_ANTENNA: IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n"); search_tbl->lq_type = LQ_NONE; if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; if (!rs_is_other_ant_connected(lq_sta->antenna, tbl->antenna_type)) break; memcpy(search_tbl, tbl, sz); search_tbl->action = IWL_SISO_SWITCH_MIMO; rs_toggle_antenna(&(search_tbl->current_rate), search_tbl); lq_sta->search_better_tbl = 1; goto out; case IWL_SISO_SWITCH_MIMO: IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n"); memcpy(search_tbl, tbl, sz); search_tbl->lq_type = LQ_MIMO; search_tbl->is_SGI = 0; search_tbl->is_fat = 0; search_tbl->antenna_type = ANT_BOTH; ret = rs_switch_to_mimo(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->search_better_tbl = 1; goto out; } break; case IWL_SISO_SWITCH_GI: IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n"); memcpy(search_tbl, tbl, sz); search_tbl->action = 0; if (search_tbl->is_SGI) search_tbl->is_SGI = 0; else if (!is_green) search_tbl->is_SGI = 1; else break; lq_sta->search_better_tbl = 1; if ((tbl->lq_type == LQ_SISO) && (tbl->is_SGI)) { s32 tpt = lq_sta->last_tpt / 100; if (((!tbl->is_fat) && (tpt >= expected_tpt_siso20MHz[index])) || ((tbl->is_fat) && (tpt >= expected_tpt_siso40MHz[index]))) lq_sta->search_better_tbl = 0; } rs_get_expected_tpt_table(lq_sta, search_tbl); rs_mcs_from_tbl(&search_tbl->current_rate, search_tbl, index, is_green); goto out; } tbl->action++; if (tbl->action > IWL_SISO_SWITCH_GI) tbl->action = IWL_SISO_SWITCH_ANTENNA; if (tbl->action == start_action) break; } return 0; out: tbl->action++; if (tbl->action > IWL_SISO_SWITCH_GI) tbl->action = IWL_SISO_SWITCH_ANTENNA; return 0; } /* * Try to switch to new modulation mode from MIMO */ static int rs_move_mimo_to_other(struct iwl_priv *priv, struct iwl4965_lq_sta *lq_sta, struct ieee80211_conf *conf, struct sta_info *sta, int index) { int ret; s8 is_green = lq_sta->is_green; struct iwl4965_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); struct iwl4965_scale_tbl_info *search_tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); u32 sz = (sizeof(struct iwl4965_scale_tbl_info) - (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; for (;;) { lq_sta->action_counter++; switch (tbl->action) { case IWL_MIMO_SWITCH_ANTENNA_A: case IWL_MIMO_SWITCH_ANTENNA_B: IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n"); /* Set up new search table for SISO */ memcpy(search_tbl, tbl, sz); search_tbl->lq_type = LQ_SISO; search_tbl->is_SGI = 0; search_tbl->is_fat = 0; if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A) search_tbl->antenna_type = ANT_MAIN; else search_tbl->antenna_type = ANT_AUX; ret = rs_switch_to_siso(priv, lq_sta, conf, sta, search_tbl, index); if (!ret) { lq_sta->search_better_tbl = 1; goto out; } break; case IWL_MIMO_SWITCH_GI: IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n"); /* Set up new search table for MIMO */ memcpy(search_tbl, tbl, sz); search_tbl->lq_type = LQ_MIMO; search_tbl->antenna_type = ANT_BOTH; search_tbl->action = 0; if (search_tbl->is_SGI) search_tbl->is_SGI = 0; else search_tbl->is_SGI = 1; lq_sta->search_better_tbl = 1; /* * 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->lq_type == LQ_MIMO) && (tbl->is_SGI)) { s32 tpt = lq_sta->last_tpt / 100; if (((!tbl->is_fat) && (tpt >= expected_tpt_mimo20MHz[index])) || ((tbl->is_fat) && (tpt >= expected_tpt_mimo40MHz[index]))) lq_sta->search_better_tbl = 0; } rs_get_expected_tpt_table(lq_sta, search_tbl); rs_mcs_from_tbl(&search_tbl->current_rate, search_tbl, index, is_green); goto out; } tbl->action++; if (tbl->action > IWL_MIMO_SWITCH_GI) tbl->action = IWL_MIMO_SWITCH_ANTENNA_A; if (tbl->action == start_action) break; } return 0; out: tbl->action++; if (tbl->action > IWL_MIMO_SWITCH_GI) tbl->action = IWL_MIMO_SWITCH_ANTENNA_A; 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 iwl4965_lq_sta *lq_sta) { struct iwl4965_scale_tbl_info *tbl; int i; int active_tbl; int flush_interval_passed = 0; 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)); /* For now, disable the elapsed time criterion */ flush_interval_passed = 0; /* * 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_HT("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_HT("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 net_device *dev, struct ieee80211_hdr *hdr, struct sta_info *sta) { struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_hw *hw = local_to_hw(local); struct ieee80211_conf *conf = &hw->conf; int low = IWL_RATE_INVALID; int high = IWL_RATE_INVALID; int index; int i; struct iwl4965_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 fc, rate_mask; u8 update_lq = 0; struct iwl4965_lq_sta *lq_sta; struct iwl4965_scale_tbl_info *tbl, *tbl1; u16 rate_scale_index_msk = 0; struct iwl4965_rate mcs_rate; u8 is_green = 0; u8 active_tbl = 0; u8 done_search = 0; u16 high_low; #ifdef CONFIG_IWL4965_HT u8 tid = MAX_TID_COUNT; __le16 *qc; #endif IWL_DEBUG_RATE("rate scale calculate new rate for skb\n"); fc = le16_to_cpu(hdr->frame_control); if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) { /* Send management frames and broadcast/multicast data using * lowest rate. */ /* TODO: this could probably be improved.. */ return; } if (!sta || !sta->rate_ctrl_priv) return; if (!priv->lq_mngr.lq_ready) { IWL_DEBUG_RATE("still rate scaling not ready\n"); return; } lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; #ifdef CONFIG_IWL4965_HT qc = ieee80211_get_qos_ctrl(hdr); if (qc) { tid = (u8)(le16_to_cpu(*qc) & 0xf); rs_tl_add_packet(lq_sta, tid); } #endif /* * 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 = sta->last_txrate_idx; IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index, tbl->lq_type); /* rates available for this association, and for modulation mode */ rs_get_supported_rates(lq_sta, hdr, tbl->lq_type, &rate_mask); IWL_DEBUG_RATE("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 current rate is no longer supported on current association, * or user changed preferences for rates, find a new supported rate. */ if (index < 0 || !((1 << index) & rate_scale_index_msk)) { index = IWL_INVALID_VALUE; update_lq = 1; /* get the highest available rate */ for (i = 0; i <= IWL_RATE_COUNT; i++) { if ((1 << i) & rate_scale_index_msk) index = i; } if (index == IWL_INVALID_VALUE) { IWL_WARNING("Can not find a suitable rate\n"); return; } } /* Get expected throughput table and history window for current rate */ if (!tbl->expected_tpt) rs_get_expected_tpt_table(lq_sta, tbl); 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)) || (tbl->expected_tpt == NULL)) { IWL_DEBUG_RATE("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); /* Set up new rate table in uCode, if needed */ if (update_lq) { rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq); iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); } goto out; /* Else we have enough samples; calculate estimate of * actual average throughput */ } else 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) { int success_limit = IWL_RATE_SCALE_SWITCH; /* 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->success_ratio > success_limit) || (window->average_tpt > lq_sta->last_tpt)) { if (!is_legacy(tbl->lq_type)) { IWL_DEBUG_HT("LQ: we are switching to HT" " rate suc %d current tpt %d" " old tpt %d\n", window->success_ratio, window->average_tpt, lq_sta->last_tpt); 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 { /* 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 = iwl4965_hwrate_to_plcp_idx( tbl->current_rate.rate_n_flags); current_tpt = lq_sta->last_tpt; /* Need to set up a new rate table in uCode */ update_lq = 1; IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n"); } /* 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(index, rate_scale_index_msk, tbl->lq_type); low = high_low & 0xff; high = (high_low >> 8) & 0xff; /* 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; /* Assume rate increase */ scale_action = 1; /* Too many failures, decrease rate */ if ((window->success_ratio <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) { IWL_DEBUG_RATE("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)) scale_action = 1; /* 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) scale_action = 1; else { IWL_DEBUG_RATE ("decrease rate because of high tpt\n"); scale_action = -1; } /* 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 ("decrease rate because of low tpt\n"); scale_action = -1; } else 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) { if ((low != IWL_RATE_INVALID) && ((window->success_ratio > IWL_RATE_HIGH_TH) || (current_tpt > (100 * tbl->expected_tpt[low])))) scale_action = 0; /* Sanity check; asked for increase, but success rate has not been great * even at old rate, higher rate will be worse. Don't change it. */ } else if ((scale_action == 1) && (window->success_ratio < IWL_RATE_INCREASE_TH)) 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_HT("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) { rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq); 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) { /* 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 = iwl4965_hwrate_to_plcp_idx( tbl->current_rate.rate_n_flags); IWL_DEBUG_HT("Switch current mcs: %X index: %d\n", tbl->current_rate.rate_n_flags, index); rs_fill_link_cmd(lq_sta, &tbl->current_rate, &lq_sta->lq); 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) && #ifdef CONFIG_IWL4965_HT (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) && #endif (lq_sta->action_counter >= 1)) { lq_sta->action_counter = 0; IWL_DEBUG_HT("LQ: STAY in legacy table\n"); rs_set_stay_in_table(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)) { #ifdef CONFIG_IWL4965_HT if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && (lq_sta->tx_agg_tid_en & (1 << tid)) && (tid != MAX_TID_COUNT)) { IWL_DEBUG_HT("try to aggregate tid %d\n", tid); rs_tl_turn_on_agg(priv, tid, lq_sta, sta); } #endif /*CONFIG_IWL4965_HT */ lq_sta->action_counter = 0; rs_set_stay_in_table(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: rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green); i = index; sta->last_txrate_idx = i; /* sta->txrate_idx is an index to A mode rates which start * at IWL_FIRST_OFDM_RATE */ if (lq_sta->band == IEEE80211_BAND_5GHZ) sta->txrate_idx = i - IWL_FIRST_OFDM_RATE; else sta->txrate_idx = i; return; } static void rs_initialize_lq(struct iwl_priv *priv, struct ieee80211_conf *conf, struct sta_info *sta) { int i; struct iwl4965_lq_sta *lq_sta; struct iwl4965_scale_tbl_info *tbl; u8 active_tbl = 0; int rate_idx; u8 use_green = rs_use_green(priv, conf); struct iwl4965_rate mcs_rate; if (!sta || !sta->rate_ctrl_priv) goto out; lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; i = sta->last_txrate_idx; if ((lq_sta->lq.sta_id == 0xff) && (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) goto out; 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; mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ; mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK; mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK; if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE) mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK; tbl->antenna_type = ANT_AUX; rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx); if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type)) rs_toggle_antenna(&mcs_rate, tbl); rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green); tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags; rs_get_expected_tpt_table(lq_sta, tbl); rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq); iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC); out: return; } static void rs_get_rate(void *priv_rate, struct net_device *dev, struct ieee80211_supported_band *sband, struct sk_buff *skb, struct rate_selection *sel) { int i; struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_conf *conf = &local->hw.conf; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct sta_info *sta; u16 fc; struct iwl_priv *priv = (struct iwl_priv *)priv_rate; struct iwl4965_lq_sta *lq_sta; IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); rcu_read_lock(); sta = sta_info_get(local, hdr->addr1); /* Send management frames and broadcast/multicast data using lowest * rate. */ fc = le16_to_cpu(hdr->frame_control); if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) || !sta || !sta->rate_ctrl_priv) { sel->rate = rate_lowest(local, sband, sta); goto out; } lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv; i = sta->last_txrate_idx; if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq_sta->ibss_sta_added) { u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1); DECLARE_MAC_BUF(mac); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_RATE("LQ: ADD station %s\n", print_mac(mac, hdr->addr1)); sta_id = iwl4965_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); } if (!lq_sta->ibss_sta_added) goto done; } done: if ((i < 0) || (i > IWL_RATE_COUNT)) { sel->rate = rate_lowest(local, sband, sta); goto out; } sel->rate = &priv->ieee_rates[i]; out: rcu_read_unlock(); } static void *rs_alloc_sta(void *priv, gfp_t gfp) { struct iwl4965_lq_sta *lq_sta; int i, j; IWL_DEBUG_RATE("create station rate scale window\n"); lq_sta = kzalloc(sizeof(struct iwl4965_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_rate, void *priv_sta, struct ieee80211_local *local, struct sta_info *sta) { int i, j; struct ieee80211_conf *conf = &local->hw.conf; struct ieee80211_supported_band *sband; struct iwl_priv *priv = (struct iwl_priv *)priv_rate; struct iwl4965_lq_sta *lq_sta = priv_sta; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; lq_sta->flush_timer = 0; lq_sta->supp_rates = sta->supp_rates[sband->band]; sta->txrate_idx = 3; 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("rate scale 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 == IEEE80211_IF_TYPE_AP) { u8 sta_id = iwl4965_hw_find_station(priv, sta->addr); DECLARE_MAC_BUF(mac); /* for IBSS the call are from tasklet */ IWL_DEBUG_HT("LQ: ADD station %s\n", print_mac(mac, sta->addr)); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_RATE("LQ: ADD station %s\n", print_mac(mac, sta->addr)); sta_id = iwl4965_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; } /* Find highest tx rate supported by hardware and destination station */ for (i = 0; i < sband->n_bitrates; i++) if (sta->supp_rates[sband->band] & BIT(i)) sta->txrate_idx = i; sta->last_txrate_idx = sta->txrate_idx; /* WTF is with this bogus comment? A doesn't have cck rates */ /* For MODE_IEEE80211A, cck rates are at end of rate table */ if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; lq_sta->is_dup = 0; lq_sta->valid_antenna = priv->valid_antenna; lq_sta->antenna = priv->antenna; lq_sta->is_green = rs_use_green(priv, conf); lq_sta->active_rate = priv->active_rate; lq_sta->active_rate &= ~(0x1000); lq_sta->active_rate_basic = priv->active_rate_basic; lq_sta->band = priv->band; #ifdef CONFIG_IWL4965_HT /* * 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 = (priv->current_ht_config.supp_mcs_set[0] << 1); lq_sta->active_siso_rate |= (priv->current_ht_config.supp_mcs_set[0] & 0x1); lq_sta->active_siso_rate &= ~((u16)0x2); lq_sta->active_siso_rate = lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE; /* Same here */ lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1); lq_sta->active_mimo_rate |= (priv->current_ht_config.supp_mcs_set[1] & 0x1); lq_sta->active_mimo_rate &= ~((u16)0x2); lq_sta->active_mimo_rate = lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE; IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n", lq_sta->active_siso_rate, lq_sta->active_mimo_rate); /* as default allow aggregation for all tids */ lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; #endif /*CONFIG_IWL4965_HT*/ #ifdef CONFIG_MAC80211_DEBUGFS lq_sta->drv = priv; #endif if (priv->assoc_station_added) priv->lq_mngr.lq_ready = 1; rs_initialize_lq(priv, conf, sta); } static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta, struct iwl4965_rate *tx_mcs, struct iwl_link_quality_cmd *lq_cmd) { int index = 0; int rate_idx; int repeat_rate = 0; u8 ant_toggle_count = 0; u8 use_ht_possible = 1; struct iwl4965_rate new_rate; struct iwl4965_scale_tbl_info tbl_type = { 0 }; /* Override starting rate (index 0) if needed for debug purposes */ rs_dbgfs_set_mcs(lq_sta, tx_mcs, index); /* Interpret rate_n_flags */ rs_get_tbl_info_from_mcs(tx_mcs, 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_count = 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(tx_mcs->rate_n_flags); new_rate.rate_n_flags = tx_mcs->rate_n_flags; if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN)) lq_cmd->general_params.single_stream_ant_msk = LINK_QUAL_ANT_A_MSK; else lq_cmd->general_params.single_stream_ant_msk = LINK_QUAL_ANT_B_MSK; index++; repeat_rate--; /* 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_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE) ant_toggle_count++; else { rs_toggle_antenna(&new_rate, &tbl_type); ant_toggle_count = 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.rate_n_flags); 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 */ rs_get_lower_rate(lq_sta, &tbl_type, rate_idx, use_ht_possible, &new_rate); /* How many times should we repeat the next rate? */ if (is_legacy(tbl_type.lq_type)) { if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE) ant_toggle_count++; else { rs_toggle_antenna(&new_rate, &tbl_type); ant_toggle_count = 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.rate_n_flags); index++; repeat_rate--; } lq_cmd->general_params.dual_stream_ant_msk = 3; 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_local *local) { return local->hw.priv; } /* rate scale requires free function to be implemented */ static void rs_free(void *priv_rate) { return; } static void rs_clear(void *priv_rate) { struct iwl_priv *priv = (struct iwl_priv *) priv_rate; IWL_DEBUG_RATE("enter\n"); priv->lq_mngr.lq_ready = 0; IWL_DEBUG_RATE("leave\n"); } static void rs_free_sta(void *priv, void *priv_sta) { struct iwl4965_lq_sta *lq_sta = priv_sta; IWL_DEBUG_RATE("enter\n"); kfree(lq_sta); IWL_DEBUG_RATE("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 iwl4965_lq_sta *lq_sta, struct iwl4965_rate *mcs, int index) { u32 base_rate; if (lq_sta->band == IEEE80211_BAND_5GHZ) base_rate = 0x800D; else base_rate = 0x820A; if (lq_sta->dbg_fixed.rate_n_flags) { if (index < 12) mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags; else mcs->rate_n_flags = base_rate; IWL_DEBUG_RATE("Fixed rate ON\n"); return; } IWL_DEBUG_RATE("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 iwl4965_lq_sta *lq_sta = file->private_data; char buf[64]; int buf_size; u32 parsed_rate; 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_n_flags = parsed_rate; else lq_sta->dbg_fixed.rate_n_flags = 0; lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ IWL_DEBUG_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags); if (lq_sta->dbg_fixed.rate_n_flags) { rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq); 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[1024]; int desc = 0; int i = 0; struct iwl4965_lq_sta *lq_sta = file->private_data; 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_rate); desc += sprintf(buff+desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed.rate_n_flags); 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)); return simple_read_from_buffer(user_buf, count, ppos, buff, desc); } 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[1024]; int desc = 0; int i, j; struct iwl4965_lq_sta *lq_sta = file->private_data; 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.rate_n_flags); 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); } } return simple_read_from_buffer(user_buf, count, ppos, buff, desc); } 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 iwl4965_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); #ifdef CONFIG_IWL4965_HT 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); #endif } static void rs_remove_debugfs(void *priv, void *priv_sta) { struct iwl4965_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); #ifdef CONFIG_IWL4965_HT debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file); #endif } #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, .clear = rs_clear, .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 iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id) { struct ieee80211_local *local = hw_to_local(hw); struct iwl_priv *priv = hw->priv; struct iwl4965_lq_sta *lq_sta; struct sta_info *sta; int cnt = 0, i; u32 samples = 0, success = 0, good = 0; unsigned long now = jiffies; u32 max_time = 0; u8 lq_type, antenna; rcu_read_lock(); sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); if (!sta || !sta->rate_ctrl_priv) { if (sta) IWL_DEBUG_RATE("leave - no private rate data!\n"); else IWL_DEBUG_RATE("leave - no station!\n"); rcu_read_unlock(); return sprintf(buf, "station %d not found\n", sta_id); } lq_sta = (void *)sta->rate_ctrl_priv; lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type; antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type; if (is_legacy(lq_type)) i = IWL_RATE_54M_INDEX; else i = IWL_RATE_60M_INDEX; while (1) { u64 mask; int j; int active = lq_sta->active_tbl; cnt += sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2); mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1)); for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1) buf[cnt++] = (lq_sta->lq_info[active].win[i].data & mask) ? '1' : '0'; samples += lq_sta->lq_info[active].win[i].counter; good += lq_sta->lq_info[active].win[i].success_counter; success += lq_sta->lq_info[active].win[i].success_counter * iwl4965_rates[i].ieee; if (lq_sta->lq_info[active].win[i].stamp) { int delta = jiffies_to_msecs(now - lq_sta->lq_info[active].win[i].stamp); if (delta > max_time) max_time = delta; cnt += sprintf(&buf[cnt], "%5dms\n", delta); } else buf[cnt++] = '\n'; j = iwl4965_get_prev_ieee_rate(i); if (j == i) break; i = j; } /* Display the average rate of all samples taken. * * NOTE: We multiply # of samples by 2 since the IEEE measurement * added from iwl4965_rates is actually 2X the rate */ if (samples) cnt += sprintf(&buf[cnt], "\nAverage rate is %3d.%02dMbs over last %4dms\n" "%3d%% success (%d good packets over %d tries)\n", success / (2 * samples), (success * 5 / samples) % 10, max_time, good * 100 / samples, good, samples); else cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n"); cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d " "active_search %d rate index %d\n", lq_type, antenna, lq_sta->search_better_tbl, sta->last_txrate_idx); rcu_read_unlock(); return cnt; } void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) { struct iwl_priv *priv = hw->priv; priv->lq_mngr.lq_ready = 1; } int iwl4965_rate_control_register(void) { return ieee80211_rate_control_register(&rs_ops); } void iwl4965_rate_control_unregister(void) { ieee80211_rate_control_unregister(&rs_ops); }