/****************************************************************************** * * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA * * The full GNU General Public License is included in this distribution in the * file called LICENSE. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include #include #include #include #include "iwl-commands.h" #include "3945.h" #include "iwl-sta.h" #define RS_NAME "iwl-3945-rs" static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = { 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 }; static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = { 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 }; static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = { 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 }; static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = { 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 }; struct il3945_tpt_entry { s8 min_rssi; u8 idx; }; static struct il3945_tpt_entry il3945_tpt_table_a[] = { {-60, RATE_54M_IDX}, {-64, RATE_48M_IDX}, {-72, RATE_36M_IDX}, {-80, RATE_24M_IDX}, {-84, RATE_18M_IDX}, {-85, RATE_12M_IDX}, {-87, RATE_9M_IDX}, {-89, RATE_6M_IDX} }; static struct il3945_tpt_entry il3945_tpt_table_g[] = { {-60, RATE_54M_IDX}, {-64, RATE_48M_IDX}, {-68, RATE_36M_IDX}, {-80, RATE_24M_IDX}, {-84, RATE_18M_IDX}, {-85, RATE_12M_IDX}, {-86, RATE_11M_IDX}, {-88, RATE_5M_IDX}, {-90, RATE_2M_IDX}, {-92, RATE_1M_IDX} }; #define RATE_MAX_WINDOW 62 #define RATE_FLUSH (3*HZ) #define RATE_WIN_FLUSH (HZ/2) #define IL39_RATE_HIGH_TH 11520 #define IL_SUCCESS_UP_TH 8960 #define IL_SUCCESS_DOWN_TH 10880 #define RATE_MIN_FAILURE_TH 6 #define RATE_MIN_SUCCESS_TH 8 #define RATE_DECREASE_TH 1920 #define RATE_RETRY_TH 15 static u8 il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band) { u32 idx = 0; u32 table_size = 0; struct il3945_tpt_entry *tpt_table = NULL; if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL) rssi = IL_MIN_RSSI_VAL; switch (band) { case IEEE80211_BAND_2GHZ: tpt_table = il3945_tpt_table_g; table_size = ARRAY_SIZE(il3945_tpt_table_g); break; case IEEE80211_BAND_5GHZ: tpt_table = il3945_tpt_table_a; table_size = ARRAY_SIZE(il3945_tpt_table_a); break; default: BUG(); break; } while (idx < table_size && rssi < tpt_table[idx].min_rssi) idx++; idx = min(idx, (table_size - 1)); return tpt_table[idx].idx; } static void il3945_clear_win(struct il3945_rate_scale_data *win) { win->data = 0; win->success_counter = 0; win->success_ratio = -1; win->counter = 0; win->average_tpt = IL_INVALID_VALUE; win->stamp = 0; } /** * il3945_rate_scale_flush_wins - flush out the rate scale wins * * Returns the number of wins that have gathered data but were * not flushed. If there were any that were not flushed, then * reschedule the rate flushing routine. */ static int il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta) { int unflushed = 0; int i; unsigned long flags; struct il_priv *il __maybe_unused = rs_sta->il; /* * For each rate, if we have collected data on that rate * and it has been more than RATE_WIN_FLUSH * since we flushed, clear out the gathered stats */ for (i = 0; i < RATE_COUNT_3945; i++) { if (!rs_sta->win[i].counter) continue; spin_lock_irqsave(&rs_sta->lock, flags); if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) { D_RATE("flushing %d samples of rate " "idx %d\n", rs_sta->win[i].counter, i); il3945_clear_win(&rs_sta->win[i]); } else unflushed++; spin_unlock_irqrestore(&rs_sta->lock, flags); } return unflushed; } #define RATE_FLUSH_MAX 5000 /* msec */ #define RATE_FLUSH_MIN 50 /* msec */ #define IL_AVERAGE_PACKETS 1500 static void il3945_bg_rate_scale_flush(unsigned long data) { struct il3945_rs_sta *rs_sta = (void *)data; struct il_priv *il __maybe_unused = rs_sta->il; int unflushed = 0; unsigned long flags; u32 packet_count, duration, pps; D_RATE("enter\n"); unflushed = il3945_rate_scale_flush_wins(rs_sta); spin_lock_irqsave(&rs_sta->lock, flags); /* Number of packets Rx'd since last time this timer ran */ packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; rs_sta->last_tx_packets = rs_sta->tx_packets + 1; if (unflushed) { duration = jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); D_RATE("Tx'd %d packets in %dms\n", packet_count, duration); /* Determine packets per second */ if (duration) pps = (packet_count * 1000) / duration; else pps = 0; if (pps) { duration = (IL_AVERAGE_PACKETS * 1000) / pps; if (duration < RATE_FLUSH_MIN) duration = RATE_FLUSH_MIN; else if (duration > RATE_FLUSH_MAX) duration = RATE_FLUSH_MAX; } else duration = RATE_FLUSH_MAX; rs_sta->flush_time = msecs_to_jiffies(duration); D_RATE("new flush period: %d msec ave %d\n", duration, packet_count); mod_timer(&rs_sta->rate_scale_flush, jiffies + rs_sta->flush_time); rs_sta->last_partial_flush = jiffies; } else { rs_sta->flush_time = RATE_FLUSH; rs_sta->flush_pending = 0; } /* If there weren't any unflushed entries, we don't schedule the timer * to run again */ rs_sta->last_flush = jiffies; spin_unlock_irqrestore(&rs_sta->lock, flags); D_RATE("leave\n"); } /** * il3945_collect_tx_data - Update the success/failure sliding win * * We keep a sliding win of the last 64 packets transmitted * at this rate. win->data contains the bitmask of successful * packets. */ static void il3945_collect_tx_data(struct il3945_rs_sta *rs_sta, struct il3945_rate_scale_data *win, int success, int retries, int idx) { unsigned long flags; s32 fail_count; struct il_priv *il __maybe_unused = rs_sta->il; if (!retries) { D_RATE("leave: retries == 0 -- should be at least 1\n"); return; } spin_lock_irqsave(&rs_sta->lock, flags); /* * Keep track of only the latest 62 tx frame attempts in this rate's * history win; anything older isn't really relevant any more. * If we have filled up the sliding win, 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 (win->counter >= RATE_MAX_WINDOW) { /* remove earliest */ win->counter = RATE_MAX_WINDOW - 1; if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) { win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1)); win->success_counter--; } } /* Increment frames-attempted counter */ win->counter++; /* Shift bitmap by one frame (throw away oldest history), * OR in "1", and increment "success" if this * frame was successful. */ win->data <<= 1; if (success > 0) { win->success_counter++; win->data |= 0x1; success--; } retries--; } /* Calculate current success ratio, avoid divide-by-0! */ if (win->counter > 0) win->success_ratio = 128 * (100 * win->success_counter) / win->counter; else win->success_ratio = IL_INVALID_VALUE; fail_count = win->counter - win->success_counter; /* Calculate average throughput, if we have enough history. */ if (fail_count >= RATE_MIN_FAILURE_TH || win->success_counter >= RATE_MIN_SUCCESS_TH) win->average_tpt = ((win->success_ratio * rs_sta->expected_tpt[idx] + 64) / 128); else win->average_tpt = IL_INVALID_VALUE; /* Tag this win as having been updated */ win->stamp = jiffies; spin_unlock_irqrestore(&rs_sta->lock, flags); } /* * Called after adding a new station to initialize rate scaling */ void il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id) { struct ieee80211_hw *hw = il->hw; struct ieee80211_conf *conf = &il->hw->conf; struct il3945_sta_priv *psta; struct il3945_rs_sta *rs_sta; struct ieee80211_supported_band *sband; int i; D_INFO("enter\n"); if (sta_id == il->ctx.bcast_sta_id) goto out; psta = (struct il3945_sta_priv *) sta->drv_priv; rs_sta = &psta->rs_sta; sband = hw->wiphy->bands[conf->channel->band]; rs_sta->il = il; rs_sta->start_rate = RATE_INVALID; /* default to just 802.11b */ rs_sta->expected_tpt = il3945_expected_tpt_b; rs_sta->last_partial_flush = jiffies; rs_sta->last_flush = jiffies; rs_sta->flush_time = RATE_FLUSH; rs_sta->last_tx_packets = 0; rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; rs_sta->rate_scale_flush.function = il3945_bg_rate_scale_flush; for (i = 0; i < RATE_COUNT_3945; i++) il3945_clear_win(&rs_sta->win[i]); /* 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.. */ for (i = sband->n_bitrates - 1; i >= 0; i--) { if (sta->supp_rates[sband->band] & (1 << i)) { rs_sta->last_txrate_idx = i; break; } } il->_3945.sta_supp_rates = sta->supp_rates[sband->band]; /* For 5 GHz band it start at IL_FIRST_OFDM_RATE */ if (sband->band == IEEE80211_BAND_5GHZ) { rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE; il->_3945.sta_supp_rates = il->_3945.sta_supp_rates << IL_FIRST_OFDM_RATE; } out: il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS; D_INFO("leave\n"); } static void *il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) { return hw->priv; } /* rate scale requires free function to be implemented */ static void il3945_rs_free(void *il) { return; } static void *il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp) { struct il3945_rs_sta *rs_sta; struct il3945_sta_priv *psta = (void *) sta->drv_priv; struct il_priv *il __maybe_unused = il_priv; D_RATE("enter\n"); rs_sta = &psta->rs_sta; spin_lock_init(&rs_sta->lock); init_timer(&rs_sta->rate_scale_flush); D_RATE("leave\n"); return rs_sta; } static void il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta) { struct il3945_rs_sta *rs_sta = il_sta; /* * Be careful not to use any members of il3945_rs_sta (like trying * to use il_priv to print out debugging) since it may not be fully * initialized at this point. */ del_timer_sync(&rs_sta->rate_scale_flush); } /** * il3945_rs_tx_status - Update rate control values based on Tx results * * NOTE: Uses il_priv->retry_rate for the # of retries attempted by * the hardware for each rate. */ static void il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *il_sta, struct sk_buff *skb) { s8 retries = 0, current_count; int scale_rate_idx, first_idx, last_idx; unsigned long flags; struct il_priv *il = (struct il_priv *)il_rate; struct il3945_rs_sta *rs_sta = il_sta; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); D_RATE("enter\n"); retries = info->status.rates[0].count; /* Sanity Check for retries */ if (retries > RATE_RETRY_TH) retries = RATE_RETRY_TH; first_idx = sband->bitrates[info->status.rates[0].idx].hw_value; if (first_idx < 0 || first_idx >= RATE_COUNT_3945) { D_RATE("leave: Rate out of bounds: %d\n", first_idx); return; } if (!il_sta) { D_RATE("leave: No STA il data to update!\n"); return; } /* Treat uninitialized rate scaling data same as non-existing. */ if (!rs_sta->il) { D_RATE("leave: STA il data uninitialized!\n"); return; } rs_sta->tx_packets++; scale_rate_idx = first_idx; last_idx = first_idx; /* * Update the win for each rate. We determine which rates * were Tx'd based on the total number of retries vs. the number * of retries configured for each rate -- currently set to the * il value 'retry_rate' vs. rate specific * * On exit from this while loop last_idx indicates the rate * at which the frame was finally transmitted (or failed if no * ACK) */ while (retries > 1) { if ((retries - 1) < il->retry_rate) { current_count = (retries - 1); last_idx = scale_rate_idx; } else { current_count = il->retry_rate; last_idx = il3945_rs_next_rate(il, scale_rate_idx); } /* Update this rate accounting for as many retries * as was used for it (per current_count) */ il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0, current_count, scale_rate_idx); D_RATE("Update rate %d for %d retries.\n", scale_rate_idx, current_count); retries -= current_count; scale_rate_idx = last_idx; } /* Update the last idx win with success/failure based on ACK */ D_RATE("Update rate %d with %s.\n", last_idx, (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure"); il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx], info->flags & IEEE80211_TX_STAT_ACK, 1, last_idx); /* We updated the rate scale win -- if its been more than * flush_time since the last run, schedule the flush * again */ spin_lock_irqsave(&rs_sta->lock, flags); if (!rs_sta->flush_pending && time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) { rs_sta->last_partial_flush = jiffies; rs_sta->flush_pending = 1; mod_timer(&rs_sta->rate_scale_flush, jiffies + rs_sta->flush_time); } spin_unlock_irqrestore(&rs_sta->lock, flags); D_RATE("leave\n"); } static u16 il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask, enum ieee80211_band band) { u8 high = RATE_INVALID; u8 low = RATE_INVALID; struct il_priv *il __maybe_unused = rs_sta->il; /* 802.11A walks to the next literal adjacent rate in * the rate table */ if (unlikely(band == IEEE80211_BAND_5GHZ)) { int i; u32 mask; /* Find the previous rate that is in the rate mask */ i = idx - 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 = idx + 1; for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) { if (rate_mask & mask) { high = i; break; } } return (high << 8) | low; } low = idx; while (low != RATE_INVALID) { if (rs_sta->tgg) low = il3945_rates[low].prev_rs_tgg; else low = il3945_rates[low].prev_rs; if (low == RATE_INVALID) break; if (rate_mask & (1 << low)) break; D_RATE("Skipping masked lower rate: %d\n", low); } high = idx; while (high != RATE_INVALID) { if (rs_sta->tgg) high = il3945_rates[high].next_rs_tgg; else high = il3945_rates[high].next_rs; if (high == RATE_INVALID) break; if (rate_mask & (1 << high)) break; D_RATE("Skipping masked higher rate: %d\n", high); } return (high << 8) | low; } /** * il3945_rs_get_rate - find the rate for the requested packet * * Returns the ieee80211_rate structure allocated by the driver. * * The rate control algorithm has no internal mapping between hw_mode's * rate ordering and the rate ordering used by the rate control algorithm. * * The rate control algorithm uses a single table of rates that goes across * the entire A/B/G spectrum vs. being limited to just one particular * hw_mode. * * As such, we can't convert the idx obtained below into the hw_mode's * rate table and must reference the driver allocated rate table * */ static void il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta, struct ieee80211_tx_rate_control *txrc) { struct ieee80211_supported_band *sband = txrc->sband; struct sk_buff *skb = txrc->skb; u8 low = RATE_INVALID; u8 high = RATE_INVALID; u16 high_low; int idx; struct il3945_rs_sta *rs_sta = il_sta; struct il3945_rate_scale_data *win = NULL; int current_tpt = IL_INVALID_VALUE; int low_tpt = IL_INVALID_VALUE; int high_tpt = IL_INVALID_VALUE; u32 fail_count; s8 scale_action = 0; unsigned long flags; u16 rate_mask; s8 max_rate_idx = -1; struct il_priv *il __maybe_unused = (struct il_priv *)il_r; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); D_RATE("enter\n"); /* Treat uninitialized rate scaling data same as non-existing. */ if (rs_sta && !rs_sta->il) { D_RATE("Rate scaling information not initialized yet.\n"); il_sta = NULL; } if (rate_control_send_low(sta, il_sta, txrc)) return; rate_mask = sta->supp_rates[sband->band]; /* get user max rate if set */ max_rate_idx = txrc->max_rate_idx; if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1) max_rate_idx += IL_FIRST_OFDM_RATE; if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT) max_rate_idx = -1; idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1); if (sband->band == IEEE80211_BAND_5GHZ) rate_mask = rate_mask << IL_FIRST_OFDM_RATE; spin_lock_irqsave(&rs_sta->lock, flags); /* for recent assoc, choose best rate regarding * to rssi value */ if (rs_sta->start_rate != RATE_INVALID) { if (rs_sta->start_rate < idx && (rate_mask & (1 << rs_sta->start_rate))) idx = rs_sta->start_rate; rs_sta->start_rate = RATE_INVALID; } /* force user max rate if set by user */ if (max_rate_idx != -1 && max_rate_idx < idx) { if (rate_mask & (1 << max_rate_idx)) idx = max_rate_idx; } win = &(rs_sta->win[idx]); fail_count = win->counter - win->success_counter; if (fail_count < RATE_MIN_FAILURE_TH && win->success_counter < RATE_MIN_SUCCESS_TH) { spin_unlock_irqrestore(&rs_sta->lock, flags); D_RATE("Invalid average_tpt on rate %d: " "counter: %d, success_counter: %d, " "expected_tpt is %sNULL\n", idx, win->counter, win->success_counter, rs_sta->expected_tpt ? "not " : ""); /* Can't calculate this yet; not enough history */ win->average_tpt = IL_INVALID_VALUE; goto out; } current_tpt = win->average_tpt; high_low = il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band); low = high_low & 0xff; high = (high_low >> 8) & 0xff; /* If user set max rate, dont allow higher than user constrain */ if (max_rate_idx != -1 && max_rate_idx < high) high = RATE_INVALID; /* Collect Measured throughputs of adjacent rates */ if (low != RATE_INVALID) low_tpt = rs_sta->win[low].average_tpt; if (high != RATE_INVALID) high_tpt = rs_sta->win[high].average_tpt; spin_unlock_irqrestore(&rs_sta->lock, flags); scale_action = 0; /* Low success ratio , need to drop the rate */ if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) { D_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 == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) { if (high != RATE_INVALID && win->success_ratio >= RATE_INCREASE_TH) scale_action = 1; else if (low != RATE_INVALID) scale_action = 0; /* Both adjacent throughputs are measured, but neither one has * better throughput; we're using the best rate, don't change * it! */ } else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE && low_tpt < current_tpt && high_tpt < current_tpt) { D_RATE("No action -- low [%d] & high [%d] < " "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt); scale_action = 0; /* At least one of the rates has better throughput */ } else { if (high_tpt != IL_INVALID_VALUE) { /* High rate has better throughput, Increase * rate */ if (high_tpt > current_tpt && win->success_ratio >= RATE_INCREASE_TH) scale_action = 1; else { D_RATE( "decrease rate because of high tpt\n"); scale_action = 0; } } else if (low_tpt != IL_INVALID_VALUE) { if (low_tpt > current_tpt) { D_RATE( "decrease rate because of low tpt\n"); scale_action = -1; } else if (win->success_ratio >= RATE_INCREASE_TH) { /* Lower rate has better * throughput,decrease rate */ scale_action = 1; } } } /* Sanity check; asked for decrease, but success rate or throughput * has been good at old rate. Don't change it. */ if (scale_action == -1 && low != RATE_INVALID && (win->success_ratio > RATE_HIGH_TH || current_tpt > 100 * rs_sta->expected_tpt[low])) scale_action = 0; switch (scale_action) { case -1: /* Decrese rate */ if (low != RATE_INVALID) idx = low; break; case 1: /* Increase rate */ if (high != RATE_INVALID) idx = high; break; case 0: default: /* No change */ break; } D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action, low, high); out: if (sband->band == IEEE80211_BAND_5GHZ) { if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE)) idx = IL_FIRST_OFDM_RATE; rs_sta->last_txrate_idx = idx; info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE; } else { rs_sta->last_txrate_idx = idx; info->control.rates[0].idx = rs_sta->last_txrate_idx; } D_RATE("leave: %d\n", idx); } #ifdef CONFIG_MAC80211_DEBUGFS static int il3945_open_file_generic(struct inode *inode, struct file *file) { file->private_data = inode->i_private; return 0; } static ssize_t il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { char *buff; int desc = 0; int j; ssize_t ret; struct il3945_rs_sta *lq_sta = file->private_data; buff = kmalloc(1024, GFP_KERNEL); if (!buff) return -ENOMEM; desc += sprintf(buff + desc, "tx packets=%d last rate idx=%d\n" "rate=0x%X flush time %d\n", lq_sta->tx_packets, lq_sta->last_txrate_idx, lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); for (j = 0; j < RATE_COUNT_3945; j++) { desc += sprintf(buff+desc, "counter=%d success=%d %%=%d\n", lq_sta->win[j].counter, lq_sta->win[j].success_counter, lq_sta->win[j].success_ratio); } ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); kfree(buff); return ret; } static const struct file_operations rs_sta_dbgfs_stats_table_ops = { .read = il3945_sta_dbgfs_stats_table_read, .open = il3945_open_file_generic, .llseek = default_llseek, }; static void il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir) { struct il3945_rs_sta *lq_sta = il_sta; lq_sta->rs_sta_dbgfs_stats_table_file = debugfs_create_file("rate_stats_table", 0600, dir, lq_sta, &rs_sta_dbgfs_stats_table_ops); } static void il3945_remove_debugfs(void *il, void *il_sta) { struct il3945_rs_sta *lq_sta = il_sta; debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); } #endif /* * Initialization of rate scaling information is done by driver after * the station is added. Since mac80211 calls this function before a * station is added we ignore it. */ static void il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *il_sta) { } static struct rate_control_ops rs_ops = { .module = NULL, .name = RS_NAME, .tx_status = il3945_rs_tx_status, .get_rate = il3945_rs_get_rate, .rate_init = il3945_rs_rate_init_stub, .alloc = il3945_rs_alloc, .free = il3945_rs_free, .alloc_sta = il3945_rs_alloc_sta, .free_sta = il3945_rs_free_sta, #ifdef CONFIG_MAC80211_DEBUGFS .add_sta_debugfs = il3945_add_debugfs, .remove_sta_debugfs = il3945_remove_debugfs, #endif }; void il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) { struct il_priv *il = hw->priv; s32 rssi = 0; unsigned long flags; struct il3945_rs_sta *rs_sta; struct ieee80211_sta *sta; struct il3945_sta_priv *psta; D_RATE("enter\n"); rcu_read_lock(); sta = ieee80211_find_sta(il->ctx.vif, il->stations[sta_id].sta.sta.addr); if (!sta) { D_RATE("Unable to find station to initialize rate scaling.\n"); rcu_read_unlock(); return; } psta = (void *) sta->drv_priv; rs_sta = &psta->rs_sta; spin_lock_irqsave(&rs_sta->lock, flags); rs_sta->tgg = 0; switch (il->band) { case IEEE80211_BAND_2GHZ: /* TODO: this always does G, not a regression */ if (il->ctx.active.flags & RXON_FLG_TGG_PROTECT_MSK) { rs_sta->tgg = 1; rs_sta->expected_tpt = il3945_expected_tpt_g_prot; } else rs_sta->expected_tpt = il3945_expected_tpt_g; break; case IEEE80211_BAND_5GHZ: rs_sta->expected_tpt = il3945_expected_tpt_a; break; case IEEE80211_NUM_BANDS: BUG(); break; } spin_unlock_irqrestore(&rs_sta->lock, flags); rssi = il->_3945.last_rx_rssi; if (rssi == 0) rssi = IL_MIN_RSSI_VAL; D_RATE("Network RSSI: %d\n", rssi); rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band); D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp); rcu_read_unlock(); } int il3945_rate_control_register(void) { return ieee80211_rate_control_register(&rs_ops); } void il3945_rate_control_unregister(void) { ieee80211_rate_control_unregister(&rs_ops); }