/****************************************************************************** * * Copyright(c) 2005 - 2007 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 <ipw2100-admin@linux.intel.com> * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include <linux/kernel.h> #include <linux/init.h> #include <linux/skbuff.h> #include <linux/wireless.h> #include <net/mac80211.h> #include <net/ieee80211.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/delay.h> #include <linux/workqueue.h> #include "../net/mac80211/ieee80211_rate.h" #include "iwl-4965.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 #define IWL_RATE_HIGH_TH 10880 #define IWL_RATE_MIN_FAILURE_TH 6 #define IWL_RATE_MIN_SUCCESS_TH 8 #define IWL_RATE_DECREASE_TH 1920 #define IWL_RATE_INCREASE_TH 8960 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) /*2 seconds */ 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 iwl_rate { u32 rate_n_flags; } __attribute__ ((packed)); struct iwl_rate_scale_data { u64 data; s32 success_counter; s32 success_ratio; s32 counter; s32 average_tpt; unsigned long stamp; }; struct iwl_scale_tbl_info { enum iwl_table_type lq_type; enum iwl_antenna_type antenna_type; u8 is_SGI; u8 is_fat; u8 is_dup; u8 action; s32 *expected_tpt; struct iwl_rate current_rate; struct iwl_rate_scale_data win[IWL_RATE_COUNT]; }; struct iwl_rate_scale_priv { u8 active_tbl; u8 enable_counter; u8 stay_in_tbl; u8 search_better_tbl; s32 last_tpt; u32 table_count_limit; u32 max_failure_limit; u32 max_success_limit; u32 table_count; u32 total_failed; u32 total_success; u32 flush_timer; u8 action_counter; u8 antenna; u8 valid_antenna; u8 is_green; u8 is_dup; u8 phymode; u8 ibss_sta_added; 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 iwl_scale_tbl_info lq_info[LQ_SIZE]; #ifdef CONFIG_MAC80211_DEBUGFS struct dentry *rs_sta_dbgfs_scale_table_file; struct dentry *rs_sta_dbgfs_stats_table_file; struct iwl_rate dbg_fixed; struct iwl_priv *drv; #endif }; 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 iwl_rate_scale_priv *lq_data, struct iwl_rate *tx_mcs, struct iwl_link_quality_cmd *tbl); #ifdef CONFIG_MAC80211_DEBUGFS static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv, struct iwl_rate *mcs, int index); #else static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv, struct iwl_rate *mcs, int index) {} #endif 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 int iwl_lq_sync_callback(struct iwl_priv *priv, struct iwl_cmd *cmd, struct sk_buff *skb) { /*We didn't cache the SKB; let the caller free it */ return 1; } static inline u8 iwl_rate_get_rate(u32 rate_n_flags) { return (u8)(rate_n_flags & 0xFF); } static int rs_send_lq_cmd(struct iwl_priv *priv, struct iwl_link_quality_cmd *lq, u8 flags) { #ifdef CONFIG_IWL4965_DEBUG int i; #endif struct iwl_host_cmd cmd = { .id = REPLY_TX_LINK_QUALITY_CMD, .len = sizeof(struct iwl_link_quality_cmd), .meta.flags = flags, .data = lq, }; if ((lq->sta_id == 0xFF) && (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) return -EINVAL; if (lq->sta_id == 0xFF) lq->sta_id = IWL_AP_ID; IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id); IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk, lq->general_params.dual_stream_ant_msk); #ifdef CONFIG_IWL4965_DEBUG for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) IWL_DEBUG_RATE("lq index %d 0x%X\n", i, lq->rs_table[i].rate_n_flags); #endif if (flags & CMD_ASYNC) cmd.meta.u.callback = iwl_lq_sync_callback; if (iwl_is_associated(priv) && priv->assoc_station_added && priv->lq_mngr.lq_ready) return iwl_send_cmd(priv, &cmd); return 0; } 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 int rs_collect_tx_data(struct iwl_rate_scale_data *windows, int scale_index, s32 tpt, u32 status) { struct iwl_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; window = &(windows[scale_index]); 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; } } window->counter = window->counter + 1; mask = window->data; window->data = (mask << 1); if (status != 0) { window->success_counter = window->success_counter + 1; window->data |= 0x1; } 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; 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; window->stamp = jiffies; return 0; } static void rs_mcs_from_tbl(struct iwl_rate *mcs_rate, struct iwl_scale_tbl_info *tbl, int index, u8 use_green) { if (is_legacy(tbl->lq_type)) { mcs_rate->rate_n_flags = iwl_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 = iwl_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 = iwl_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; } } static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate, int phymode, struct iwl_scale_tbl_info *tbl, int *rate_idx) { int index; u32 ant_msk; index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags); if (index == IWL_RATE_INVALID) { *rate_idx = -1; return -EINVAL; } tbl->is_SGI = 0; tbl->is_fat = 0; tbl->is_dup = 0; tbl->antenna_type = ANT_BOTH; 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 (phymode == MODE_IEEE80211A) 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; } else if (iwl_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; } 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 iwl_rate *new_rate, struct iwl_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) { #ifdef CONFIG_IWL4965_HT if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht) return 0; return ((priv->current_assoc_ht.is_green_field) && !(priv->current_assoc_ht.operating_mode & 0x4)); #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 iwl_rate_scale_priv *lq_data, struct ieee80211_hdr *hdr, enum iwl_table_type rate_type, u16 *data_rate) { if (is_legacy(rate_type)) *data_rate = lq_data->active_rate; else { if (is_siso(rate_type)) *data_rate = lq_data->active_siso_rate; else *data_rate = lq_data->active_mimo_rate; } if (hdr && is_multicast_ether_addr(hdr->addr1) && lq_data->active_rate_basic) *data_rate = lq_data->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 = iwl_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 = iwl_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 iwl_rate_scale_priv *lq_data, struct iwl_scale_tbl_info *tbl, u8 scale_index, u8 ht_possible, struct iwl_rate *mcs_rate) { s32 low; u16 rate_mask; u16 high_low; u8 switch_to_legacy = 0; u8 is_green = lq_data->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_data->phymode == MODE_IEEE80211A) 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_data, NULL, tbl->lq_type, &rate_mask); /* mask with station rate restriction */ if (is_legacy(tbl->lq_type)) { if (lq_data->phymode == (u8) MODE_IEEE80211A) rate_mask = (u16)(rate_mask & (lq_data->supp_rates << IWL_FIRST_OFDM_RATE)); else rate_mask = (u16)(rate_mask & lq_data->supp_rates); } /* if we did 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); } 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 iwl_rate_scale_priv *lq; 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 iwl_rate_scale_data *window = NULL; struct iwl_rate_scale_data *search_win = NULL; struct iwl_rate tx_mcs; struct iwl_scale_tbl_info tbl_type; struct iwl_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; retries = tx_resp->retry_count; if (retries > 15) retries = 15; sta = sta_info_get(local, hdr->addr1); if (!sta || !sta->rate_ctrl_priv) { if (sta) sta_info_put(sta); return; } lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv; if (!priv->lq_mngr.lq_ready) return; if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) return; table = &lq->lq; active_index = lq->active_tbl; lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx); if (!lq->antenna) lq->antenna = lq->valid_antenna; lq->antenna = lq->valid_antenna; curr_tbl = &(lq->lq_info[active_index]); search_tbl = &(lq->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]); tx_mcs.rate_n_flags = tx_resp->control.tx_rate; rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, &tbl_type, &rs_index); if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) { IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n", rs_index, tx_mcs.rate_n_flags); sta_info_put(sta); return; } if (retries && (tx_mcs.rate_n_flags != le32_to_cpu(table->rs_table[0].rate_n_flags))) { IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n", tx_mcs.rate_n_flags, le32_to_cpu(table->rs_table[0].rate_n_flags)); sta_info_put(sta); return; } while (retries) { tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, &tbl_type, &rs_index); 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, 0); } 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, 0); } if (lq->stay_in_tbl) lq->total_failed++; --retries; index++; } if (!tx_resp->retry_count) tx_mcs.rate_n_flags = tx_resp->control.tx_rate; else tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags); rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode, &tbl_type, &rs_index); if (tx_resp->flags & IEEE80211_TX_STATUS_ACK) status = 1; else status = 0; 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, status); } 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, status); } if (lq->stay_in_tbl) { if (status) lq->total_success++; else lq->total_failed++; } rs_rate_scale_perform(priv, dev, hdr, sta); sta_info_put(sta); return; } static u8 rs_is_ant_connected(u8 valid_antenna, enum iwl_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 iwl_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; } static void rs_set_stay_in_table(u8 is_legacy, struct iwl_rate_scale_priv *lq_data) { IWL_DEBUG_HT("we are staying in the same table\n"); lq_data->stay_in_tbl = 1; if (is_legacy) { lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT; lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT; lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT; } else { lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT; lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT; lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT; } lq_data->table_count = 0; lq_data->total_failed = 0; lq_data->total_success = 0; } static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data, 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_data->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_data->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 static s32 rs_get_best_rate(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, struct iwl_scale_tbl_info *tbl, u16 rate_mask, s8 index, s8 rate) { struct iwl_scale_tbl_info *active_tbl = &(lq_data->lq_info[lq_data->active_tbl]); s32 new_rate, high, low, start_hi; s32 active_sr = active_tbl->win[index].success_ratio; s32 *tpt_tbl = tbl->expected_tpt; s32 active_tpt = active_tbl->expected_tpt[index]; 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; if ((((100 * tpt_tbl[rate]) > lq_data->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))) { if (start_hi != IWL_RATE_INVALID) { new_rate = start_hi; break; } new_rate = rate; if (low != IWL_RATE_INVALID) rate = low; else break; } else { if (new_rate != IWL_RATE_INVALID) break; else if (high != IWL_RATE_INVALID) { start_hi = high; rate = high; } 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)); } static int rs_switch_to_mimo(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, struct iwl_scale_tbl_info *tbl, int index) { #ifdef CONFIG_IWL4965_HT u16 rate_mask; s32 rate; s8 is_green = lq_data->is_green; if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht) return -1; IWL_DEBUG_HT("LQ: try to switch to MIMO\n"); tbl->lq_type = LQ_MIMO; rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask); if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC) return -1; if (!rs_is_both_ant_supp(lq_data->antenna)) return -1; tbl->is_dup = lq_data->is_dup; tbl->action = 0; if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; if (tbl->is_fat) { if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; rs_get_expected_tpt_table(lq_data, tbl); rate = rs_get_best_rate(priv, lq_data, 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); #endif /*CONFIG_IWL4965_HT */ return 0; } static int rs_switch_to_siso(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, struct iwl_scale_tbl_info *tbl, int index) { #ifdef CONFIG_IWL4965_HT u16 rate_mask; u8 is_green = lq_data->is_green; s32 rate; IWL_DEBUG_HT("LQ: try to switch to SISO\n"); if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht) return -1; tbl->is_dup = lq_data->is_dup; tbl->lq_type = LQ_SISO; tbl->action = 0; rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask); if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ) tbl->is_fat = 1; else tbl->is_fat = 0; if (tbl->is_fat) { if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY) tbl->is_SGI = 1; else tbl->is_SGI = 0; } else if (priv->current_assoc_ht.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_data, tbl); rate = rs_get_best_rate(priv, lq_data, 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); #endif /*CONFIG_IWL4965_HT */ return 0; } static int rs_move_legacy_other(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, int index) { int ret = 0; struct iwl_scale_tbl_info *tbl = &(lq_data->lq_info[lq_data->active_tbl]); struct iwl_scale_tbl_info *search_tbl = &(lq_data->lq_info[(1 - lq_data->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; for (; ;) { switch (tbl->action) { case IWL_LEGACY_SWITCH_ANTENNA: IWL_DEBUG_HT("LQ Legacy switch Antenna\n"); search_tbl->lq_type = LQ_NONE; lq_data->action_counter++; if (window->success_ratio >= IWL_RS_GOOD_RATIO) break; if (!rs_is_other_ant_connected(lq_data->antenna, tbl->antenna_type)) break; memcpy(search_tbl, tbl, sz); rs_toggle_antenna(&(search_tbl->current_rate), search_tbl); rs_get_expected_tpt_table(lq_data, search_tbl); lq_data->search_better_tbl = 1; goto out; case IWL_LEGACY_SWITCH_SISO: IWL_DEBUG_HT("LQ: Legacy switch to SISO\n"); 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_data, search_tbl, index); if (!ret) { lq_data->search_better_tbl = 1; lq_data->action_counter = 0; goto out; } break; case IWL_LEGACY_SWITCH_MIMO: IWL_DEBUG_HT("LQ: Legacy switch MIMO\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_data, search_tbl, index); if (!ret) { lq_data->search_better_tbl = 1; lq_data->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; } static int rs_move_siso_to_other(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, int index) { int ret; u8 is_green = lq_data->is_green; struct iwl_scale_tbl_info *tbl = &(lq_data->lq_info[lq_data->active_tbl]); struct iwl_scale_tbl_info *search_tbl = &(lq_data->lq_info[(1 - lq_data->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; for (;;) { lq_data->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_data->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_data->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_data, search_tbl, index); if (!ret) { lq_data->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_data->search_better_tbl = 1; if ((tbl->lq_type == LQ_SISO) && (tbl->is_SGI)) { s32 tpt = lq_data->last_tpt / 100; if (((!tbl->is_fat) && (tpt >= expected_tpt_siso20MHz[index])) || ((tbl->is_fat) && (tpt >= expected_tpt_siso40MHz[index]))) lq_data->search_better_tbl = 0; } rs_get_expected_tpt_table(lq_data, 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; } static int rs_move_mimo_to_other(struct iwl_priv *priv, struct iwl_rate_scale_priv *lq_data, int index) { int ret; s8 is_green = lq_data->is_green; struct iwl_scale_tbl_info *tbl = &(lq_data->lq_info[lq_data->active_tbl]); struct iwl_scale_tbl_info *search_tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]); u32 sz = (sizeof(struct iwl_scale_tbl_info) - (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); u8 start_action = tbl->action; for (;;) { lq_data->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"); 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_data, search_tbl, index); if (!ret) { lq_data->search_better_tbl = 1; goto out; } break; case IWL_MIMO_SWITCH_GI: IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n"); 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_data->search_better_tbl = 1; if ((tbl->lq_type == LQ_MIMO) && (tbl->is_SGI)) { s32 tpt = lq_data->last_tpt / 100; if (((!tbl->is_fat) && (tpt >= expected_tpt_mimo20MHz[index])) || ((tbl->is_fat) && (tpt >= expected_tpt_mimo40MHz[index]))) lq_data->search_better_tbl = 0; } rs_get_expected_tpt_table(lq_data, 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; } static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data) { struct iwl_scale_tbl_info *tbl; int i; int active_tbl; int flush_interval_passed = 0; active_tbl = lq_data->active_tbl; tbl = &(lq_data->lq_info[active_tbl]); if (lq_data->stay_in_tbl) { if (lq_data->flush_timer) flush_interval_passed = time_after(jiffies, (unsigned long)(lq_data->flush_timer + IWL_RATE_SCALE_FLUSH_INTVL)); flush_interval_passed = 0; if ((lq_data->total_failed > lq_data->max_failure_limit) || (lq_data->total_success > lq_data->max_success_limit) || ((!lq_data->search_better_tbl) && (lq_data->flush_timer) && (flush_interval_passed))) { IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:", lq_data->total_failed, lq_data->total_success, flush_interval_passed); lq_data->stay_in_tbl = 0; lq_data->total_failed = 0; lq_data->total_success = 0; lq_data->flush_timer = 0; } else if (lq_data->table_count > 0) { lq_data->table_count++; if (lq_data->table_count >= lq_data->table_count_limit) { lq_data->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 (!lq_data->stay_in_tbl) { for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(tbl->win[i])); } } } static void rs_rate_scale_perform(struct iwl_priv *priv, struct net_device *dev, struct ieee80211_hdr *hdr, struct sta_info *sta) { 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 fc, rate_mask; u8 update_lq = 0; struct iwl_rate_scale_priv *lq_data; struct iwl_scale_tbl_info *tbl, *tbl1; u16 rate_scale_index_msk = 0; struct iwl_rate mcs_rate; u8 is_green = 0; u8 active_tbl = 0; u8 done_search = 0; u16 high_low; 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_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv; if (!lq_data->search_better_tbl) active_tbl = lq_data->active_tbl; else active_tbl = 1 - lq_data->active_tbl; tbl = &(lq_data->lq_info[active_tbl]); is_green = lq_data->is_green; index = sta->last_txrate; IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index, tbl->lq_type); rs_get_supported_rates(lq_data, 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_data->phymode == (u8) MODE_IEEE80211A) rate_scale_index_msk = (u16) (rate_mask & (lq_data->supp_rates << IWL_FIRST_OFDM_RATE)); else rate_scale_index_msk = (u16) (rate_mask & lq_data->supp_rates); } else rate_scale_index_msk = rate_mask; if (!rate_scale_index_msk) rate_scale_index_msk = rate_mask; if (index < 0 || !((1 << index) & rate_scale_index_msk)) { index = IWL_INVALID_VALUE; update_lq = 1; /* get the lowest 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; } } if (!tbl->expected_tpt) rs_get_expected_tpt_table(lq_data, tbl); window = &(tbl->win[index]); 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); window->average_tpt = IWL_INVALID_VALUE; rs_stay_in_table(lq_data); if (update_lq) { rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq); rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); } goto out; } else window->average_tpt = ((window->success_ratio * tbl->expected_tpt[index] + 64) / 128); if (lq_data->search_better_tbl) { int success_limit = IWL_RATE_SCALE_SWITCH; if ((window->success_ratio > success_limit) || (window->average_tpt > lq_data->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_data->last_tpt); lq_data->enable_counter = 1; } lq_data->active_tbl = active_tbl; current_tpt = window->average_tpt; } else { tbl->lq_type = LQ_NONE; active_tbl = lq_data->active_tbl; tbl = &(lq_data->lq_info[active_tbl]); index = iwl_rate_index_from_plcp( tbl->current_rate.rate_n_flags); update_lq = 1; current_tpt = lq_data->last_tpt; IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n"); } lq_data->search_better_tbl = 0; done_search = 1; goto lq_update; } high_low = rs_get_adjacent_rate(index, rate_scale_index_msk, tbl->lq_type); low = high_low & 0xff; high = (high_low >> 8) & 0xff; 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 = 1; 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; } else if ((low_tpt == IWL_INVALID_VALUE) && (high_tpt == IWL_INVALID_VALUE)) scale_action = 1; else if ((low_tpt != IWL_INVALID_VALUE) && (high_tpt != IWL_INVALID_VALUE) && (low_tpt < current_tpt) && (high_tpt < current_tpt)) scale_action = 0; else { if (high_tpt != IWL_INVALID_VALUE) { if (high_tpt > current_tpt) scale_action = 1; else { IWL_DEBUG_RATE ("decrease rate because of high tpt\n"); scale_action = -1; } } else if (low_tpt != IWL_INVALID_VALUE) { if (low_tpt > current_tpt) { IWL_DEBUG_RATE ("decrease rate because of low tpt\n"); scale_action = -1; } else scale_action = 1; } } 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; } else if ((scale_action == 1) && (window->success_ratio < IWL_RATE_INCREASE_TH)) scale_action = 0; switch (scale_action) { case -1: if (low != IWL_RATE_INVALID) { update_lq = 1; index = low; } break; case 1: if (high != IWL_RATE_INVALID) { update_lq = 1; index = high; } break; case 0: 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: if (update_lq) { rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green); rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq); rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); } rs_stay_in_table(lq_data); if (!update_lq && !done_search && !lq_data->stay_in_tbl) { lq_data->last_tpt = current_tpt; if (is_legacy(tbl->lq_type)) rs_move_legacy_other(priv, lq_data, index); else if (is_siso(tbl->lq_type)) rs_move_siso_to_other(priv, lq_data, index); else rs_move_mimo_to_other(priv, lq_data, index); if (lq_data->search_better_tbl) { tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]); for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(tbl->win[i])); index = iwl_rate_index_from_plcp( 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_data, &tbl->current_rate, &lq_data->lq); rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC); } tbl1 = &(lq_data->lq_info[lq_data->active_tbl]); if (is_legacy(tbl1->lq_type) && #ifdef CONFIG_IWL4965_HT !priv->current_assoc_ht.is_ht && #endif (lq_data->action_counter >= 1)) { lq_data->action_counter = 0; IWL_DEBUG_HT("LQ: STAY in legacy table\n"); rs_set_stay_in_table(1, lq_data); } if (lq_data->enable_counter && (lq_data->action_counter >= IWL_ACTION_LIMIT)) { #ifdef CONFIG_IWL4965_HT_AGG if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) && (priv->lq_mngr.agg_ctrl.auto_agg)) { priv->lq_mngr.agg_ctrl.tid_retry = TID_ALL_SPECIFIED; schedule_work(&priv->agg_work); } #endif /*CONFIG_IWL4965_HT_AGG */ lq_data->action_counter = 0; rs_set_stay_in_table(0, lq_data); } } else { if ((!update_lq) && (!done_search) && (!lq_data->flush_timer)) lq_data->flush_timer = jiffies; } out: rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green); i = index; sta->last_txrate = i; /* sta->txrate is an index to A mode rates which start * at IWL_FIRST_OFDM_RATE */ if (lq_data->phymode == (u8) MODE_IEEE80211A) sta->txrate = i - IWL_FIRST_OFDM_RATE; else sta->txrate = i; return; } static void rs_initialize_lq(struct iwl_priv *priv, struct sta_info *sta) { int i; struct iwl_rate_scale_priv *lq; struct iwl_scale_tbl_info *tbl; u8 active_tbl = 0; int rate_idx; u8 use_green = rs_use_green(priv); struct iwl_rate mcs_rate; if (!sta || !sta->rate_ctrl_priv) goto out; lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv; i = sta->last_txrate; if ((lq->lq.sta_id == 0xff) && (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)) goto out; if (!lq->search_better_tbl) active_tbl = lq->active_tbl; else active_tbl = 1 - lq->active_tbl; tbl = &(lq->lq_info[active_tbl]); if ((i < 0) || (i >= IWL_RATE_COUNT)) i = 0; mcs_rate.rate_n_flags = iwl_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->phymode, 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, tbl); rs_fill_link_cmd(lq, &mcs_rate, &lq->lq); rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC); out: return; } static void rs_get_rate(void *priv_rate, struct net_device *dev, struct ieee80211_hw_mode *mode, struct sk_buff *skb, struct rate_selection *sel) { int i; struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct sta_info *sta; struct iwl_priv *priv = (struct iwl_priv *)priv_rate; struct iwl_rate_scale_priv *lq; IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n"); sta = sta_info_get(local, hdr->addr1); if (!sta || !sta->rate_ctrl_priv) { sel->rate = rate_lowest(local, local->oper_hw_mode, sta); if (sta) sta_info_put(sta); return; } lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv; i = sta->last_txrate; if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) { u8 sta_id = iwl_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 = iwl_add_station(priv, hdr->addr1, 0, CMD_ASYNC); } if ((sta_id != IWL_INVALID_STATION)) { lq->lq.sta_id = sta_id; lq->lq.rs_table[0].rate_n_flags = 0; lq->ibss_sta_added = 1; rs_initialize_lq(priv, sta); } if (!lq->ibss_sta_added) goto done; } done: if ((i < 0) || (i > IWL_RATE_COUNT)) { sel->rate = rate_lowest(local, local->oper_hw_mode, sta); return; } sta_info_put(sta); sel->rate = &priv->ieee_rates[i]; } static void *rs_alloc_sta(void *priv, gfp_t gfp) { struct iwl_rate_scale_priv *crl; int i, j; IWL_DEBUG_RATE("create station rate scale window\n"); crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp); if (crl == NULL) return NULL; crl->lq.sta_id = 0xff; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(crl->lq_info[j].win[i])); return crl; } static void rs_rate_init(void *priv_rate, void *priv_sta, struct ieee80211_local *local, struct sta_info *sta) { int i, j; struct ieee80211_hw_mode *mode = local->oper_hw_mode; struct iwl_priv *priv = (struct iwl_priv *)priv_rate; struct iwl_rate_scale_priv *crl = priv_sta; crl->flush_timer = 0; crl->supp_rates = sta->supp_rates; sta->txrate = 3; for (j = 0; j < LQ_SIZE; j++) for (i = 0; i < IWL_RATE_COUNT; i++) rs_rate_scale_clear_window(&(crl->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.. */ crl->ibss_sta_added = 0; if (priv->iw_mode == IEEE80211_IF_TYPE_AP) { u8 sta_id = iwl_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 = iwl_add_station(priv, sta->addr, 0, CMD_ASYNC); } if ((sta_id != IWL_INVALID_STATION)) { crl->lq.sta_id = sta_id; crl->lq.rs_table[0].rate_n_flags = 0; } /* FIXME: this is w/a remove it later */ priv->assoc_station_added = 1; } for (i = 0; i < mode->num_rates; i++) { if ((sta->supp_rates & BIT(i)) && (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED)) sta->txrate = i; } sta->last_txrate = sta->txrate; /* For MODE_IEEE80211A mode cck rate are at end * rate table */ if (local->hw.conf.phymode == MODE_IEEE80211A) sta->last_txrate += IWL_FIRST_OFDM_RATE; crl->is_dup = priv->is_dup; crl->valid_antenna = priv->valid_antenna; crl->antenna = priv->antenna; crl->is_green = rs_use_green(priv); crl->active_rate = priv->active_rate; crl->active_rate &= ~(0x1000); crl->active_rate_basic = priv->active_rate_basic; crl->phymode = priv->phymode; #ifdef CONFIG_IWL4965_HT crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1); crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1); crl->active_siso_rate &= ~((u16)0x2); crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE; crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1); crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1); crl->active_mimo_rate &= ~((u16)0x2); crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE; IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate, crl->active_mimo_rate); #endif /*CONFIG_IWL4965_HT*/ #ifdef CONFIG_MAC80211_DEBUGFS crl->drv = priv; #endif if (priv->assoc_station_added) priv->lq_mngr.lq_ready = 1; rs_initialize_lq(priv, sta); } static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data, struct iwl_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 iwl_rate new_rate; struct iwl_scale_tbl_info tbl_type = { 0 }; rs_dbgfs_set_mcs(lq_data, tx_mcs, index); rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode, &tbl_type, &rate_idx); 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; 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 = 1; else lq_cmd->general_params.single_stream_ant_msk = 2; index++; repeat_rate--; while (index < LINK_QUAL_MAX_RETRY_NUM) { 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; } } rs_dbgfs_set_mcs(lq_data, &new_rate, index); 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_data->phymode, &tbl_type, &rate_idx); if (is_mimo(tbl_type.lq_type)) lq_cmd->general_params.mimo_delimiter = index; rs_get_lower_rate(lq_data, &tbl_type, rate_idx, use_ht_possible, &new_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; use_ht_possible = 0; rs_dbgfs_set_mcs(lq_data, &new_rate, index); 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; #ifdef CONFIG_IWL4965_HT #ifdef CONFIG_IWL4965_HT_AGG if (priv->lq_mngr.agg_ctrl.granted_ba) iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED); #endif /*CONFIG_IWL4965_HT_AGG */ #endif /* CONFIG_IWL4965_HT */ IWL_DEBUG_RATE("leave\n"); } static void rs_free_sta(void *priv, void *priv_sta) { struct iwl_rate_scale_priv *rs_priv = priv_sta; IWL_DEBUG_RATE("enter\n"); kfree(rs_priv); 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 iwl_rate_scale_priv *rs_priv, struct iwl_rate *mcs, int index) { u32 base_rate; if (rs_priv->phymode == (u8) MODE_IEEE80211A) base_rate = 0x800D; else base_rate = 0x820A; if (rs_priv->dbg_fixed.rate_n_flags) { if (index < 12) mcs->rate_n_flags = rs_priv->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 iwl_rate_scale_priv *rs_priv = 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) rs_priv->dbg_fixed.rate_n_flags = parsed_rate; else rs_priv->dbg_fixed.rate_n_flags = 0; rs_priv->active_rate = 0x0FFF; rs_priv->active_siso_rate = 0x1FD0; rs_priv->active_mimo_rate = 0x1FD0; IWL_DEBUG_RATE("sta_id %d rate 0x%X\n", rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags); if (rs_priv->dbg_fixed.rate_n_flags) { rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq); rs_send_lq_cmd(rs_priv->drv, &rs_priv->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 iwl_rate_scale_priv *rs_priv = file->private_data; desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id); desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n", rs_priv->total_failed, rs_priv->total_success, rs_priv->active_rate); desc += sprintf(buff+desc, "fixed rate 0x%X\n", rs_priv->dbg_fixed.rate_n_flags); desc += sprintf(buff+desc, "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n", rs_priv->lq.general_params.flags, rs_priv->lq.general_params.mimo_delimiter, rs_priv->lq.general_params.single_stream_ant_msk, rs_priv->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(rs_priv->lq.agg_params.agg_time_limit), rs_priv->lq.agg_params.agg_dis_start_th, rs_priv->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", rs_priv->lq.general_params.start_rate_index[0], rs_priv->lq.general_params.start_rate_index[1], rs_priv->lq.general_params.start_rate_index[2], rs_priv->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(rs_priv->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 iwl_rate_scale_priv *rs_priv = 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", rs_priv->active_tbl == i?"*":"x", rs_priv->lq_info[i].lq_type, rs_priv->lq_info[i].is_SGI, rs_priv->lq_info[i].is_fat, rs_priv->lq_info[i].is_dup, rs_priv->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", rs_priv->lq_info[i].win[j].counter, rs_priv->lq_info[i].win[j].success_counter, rs_priv->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 iwl_rate_scale_priv *rs_priv = priv_sta; rs_priv->rs_sta_dbgfs_scale_table_file = debugfs_create_file("rate_scale_table", 0600, dir, rs_priv, &rs_sta_dbgfs_scale_table_ops); rs_priv->rs_sta_dbgfs_stats_table_file = debugfs_create_file("rate_stats_table", 0600, dir, rs_priv, &rs_sta_dbgfs_stats_table_ops); } static void rs_remove_debugfs(void *priv, void *priv_sta) { struct iwl_rate_scale_priv *rs_priv = priv_sta; debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file); debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_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, .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 iwl_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 iwl_rate_scale_priv *rs_priv; struct sta_info *sta; int count = 0, i; u32 samples = 0, success = 0, good = 0; unsigned long now = jiffies; u32 max_time = 0; u8 lq_type, antenna; sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); if (!sta || !sta->rate_ctrl_priv) { if (sta) { sta_info_put(sta); IWL_DEBUG_RATE("leave - no private rate data!\n"); } else IWL_DEBUG_RATE("leave - no station!\n"); return sprintf(buf, "station %d not found\n", sta_id); } rs_priv = (void *)sta->rate_ctrl_priv; lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type; antenna = rs_priv->lq_info[rs_priv->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 = rs_priv->active_tbl; count += sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2); mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1)); for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1) buf[count++] = (rs_priv->lq_info[active].win[i].data & mask) ? '1' : '0'; samples += rs_priv->lq_info[active].win[i].counter; good += rs_priv->lq_info[active].win[i].success_counter; success += rs_priv->lq_info[active].win[i].success_counter * iwl_rates[i].ieee; if (rs_priv->lq_info[active].win[i].stamp) { int delta = jiffies_to_msecs(now - rs_priv->lq_info[active].win[i].stamp); if (delta > max_time) max_time = delta; count += sprintf(&buf[count], "%5dms\n", delta); } else buf[count++] = '\n'; j = iwl_get_prev_ieee_rate(i); if (j == i) break; i = j; } /* Display the average rate of all samples taken. * * NOTE: We multiple # of samples by 2 since the IEEE measurement * added from iwl_rates is actually 2X the rate */ if (samples) count += sprintf(&buf[count], "\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 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n"); count += sprintf(&buf[count], "\nrate scale type %d antenna %d " "active_search %d rate index %d\n", lq_type, antenna, rs_priv->search_better_tbl, sta->last_txrate); sta_info_put(sta); return count; } void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) { struct iwl_priv *priv = hw->priv; priv->lq_mngr.lq_ready = 1; } void iwl_rate_control_register(struct ieee80211_hw *hw) { ieee80211_rate_control_register(&rs_ops); } void iwl_rate_control_unregister(struct ieee80211_hw *hw) { ieee80211_rate_control_unregister(&rs_ops); }