/****************************************************************************** * * 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 "iwl-3945.h" #define RS_NAME "iwl-3945-rs" struct iwl3945_rate_scale_data { u64 data; s32 success_counter; s32 success_ratio; s32 counter; s32 average_tpt; unsigned long stamp; }; struct iwl3945_rs_sta { spinlock_t lock; s32 *expected_tpt; unsigned long last_partial_flush; unsigned long last_flush; u32 flush_time; u32 last_tx_packets; u32 tx_packets; u8 tgg; u8 flush_pending; u8 start_rate; u8 ibss_sta_added; struct timer_list rate_scale_flush; struct iwl3945_rate_scale_data win[IWL_RATE_COUNT]; /* used to be in sta_info */ int last_txrate_idx; }; static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT] = { 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 }; static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT] = { 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 }; static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT] = { 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 }; static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT] = { 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 }; struct iwl3945_tpt_entry { s8 min_rssi; u8 index; }; static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { {-60, IWL_RATE_54M_INDEX}, {-64, IWL_RATE_48M_INDEX}, {-72, IWL_RATE_36M_INDEX}, {-80, IWL_RATE_24M_INDEX}, {-84, IWL_RATE_18M_INDEX}, {-85, IWL_RATE_12M_INDEX}, {-87, IWL_RATE_9M_INDEX}, {-89, IWL_RATE_6M_INDEX} }; static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { {-60, IWL_RATE_54M_INDEX}, {-64, IWL_RATE_48M_INDEX}, {-68, IWL_RATE_36M_INDEX}, {-80, IWL_RATE_24M_INDEX}, {-84, IWL_RATE_18M_INDEX}, {-85, IWL_RATE_12M_INDEX}, {-86, IWL_RATE_11M_INDEX}, {-88, IWL_RATE_5M_INDEX}, {-90, IWL_RATE_2M_INDEX}, {-92, IWL_RATE_1M_INDEX} }; #define IWL_RATE_MAX_WINDOW 62 #define IWL_RATE_FLUSH (3*HZ/10) #define IWL_RATE_WIN_FLUSH (HZ/2) #define IWL_RATE_HIGH_TH 11520 #define IWL_RATE_MIN_FAILURE_TH 8 #define IWL_RATE_MIN_SUCCESS_TH 8 #define IWL_RATE_DECREASE_TH 1920 static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) { u32 index = 0; u32 table_size = 0; struct iwl3945_tpt_entry *tpt_table = NULL; if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) rssi = IWL_MIN_RSSI_VAL; switch (band) { case IEEE80211_BAND_2GHZ: tpt_table = iwl3945_tpt_table_g; table_size = ARRAY_SIZE(iwl3945_tpt_table_g); break; case IEEE80211_BAND_5GHZ: tpt_table = iwl3945_tpt_table_a; table_size = ARRAY_SIZE(iwl3945_tpt_table_a); break; default: BUG(); break; } while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) index++; index = min(index, (table_size - 1)); return tpt_table[index].index; } static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) { window->data = 0; window->success_counter = 0; window->success_ratio = -1; window->counter = 0; window->average_tpt = IWL_INV_TPT; window->stamp = 0; } /** * iwl3945_rate_scale_flush_windows - flush out the rate scale windows * * Returns the number of windows that have gathered data but were * not flushed. If there were any that were not flushed, then * reschedule the rate flushing routine. */ static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) { int unflushed = 0; int i; unsigned long flags; /* * For each rate, if we have collected data on that rate * and it has been more than IWL_RATE_WIN_FLUSH * since we flushed, clear out the gathered statistics */ for (i = 0; i < IWL_RATE_COUNT; i++) { if (!rs_sta->win[i].counter) continue; spin_lock_irqsave(&rs_sta->lock, flags); if (time_after(jiffies, rs_sta->win[i].stamp + IWL_RATE_WIN_FLUSH)) { IWL_DEBUG_RATE("flushing %d samples of rate " "index %d\n", rs_sta->win[i].counter, i); iwl3945_clear_window(&rs_sta->win[i]); } else unflushed++; spin_unlock_irqrestore(&rs_sta->lock, flags); } return unflushed; } #define IWL_RATE_FLUSH_MAX 5000 /* msec */ #define IWL_RATE_FLUSH_MIN 50 /* msec */ static void iwl3945_bg_rate_scale_flush(unsigned long data) { struct iwl3945_rs_sta *rs_sta = (void *)data; int unflushed = 0; unsigned long flags; u32 packet_count, duration, pps; IWL_DEBUG_RATE("enter\n"); unflushed = iwl3945_rate_scale_flush_windows(rs_sta); spin_lock_irqsave(&rs_sta->lock, flags); rs_sta->flush_pending = 0; /* 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); /* duration = jiffies_to_msecs(rs_sta->flush_time); */ IWL_DEBUG_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 = IWL_RATE_FLUSH_MAX / pps; if (duration < IWL_RATE_FLUSH_MIN) duration = IWL_RATE_FLUSH_MIN; } else duration = IWL_RATE_FLUSH_MAX; rs_sta->flush_time = msecs_to_jiffies(duration); IWL_DEBUG_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; } /* 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); IWL_DEBUG_RATE("leave\n"); } /** * iwl3945_collect_tx_data - Update the success/failure sliding window * * We keep a sliding window of the last 64 packets transmitted * at this rate. window->data contains the bitmask of successful * packets. */ static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, struct iwl3945_rate_scale_data *window, int success, int retries) { unsigned long flags; if (!retries) { IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n"); return; } while (retries--) { spin_lock_irqsave(&rs_sta->lock, flags); /* If we have filled up the window then subtract one from the * success counter if the high-bit is counting toward * success */ if (window->counter == IWL_RATE_MAX_WINDOW) { if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) window->success_counter--; } else window->counter++; /* Slide the window to the left one bit */ window->data = (window->data << 1); /* If this packet was a success then set the low bit high */ if (success) { window->success_counter++; window->data |= 1; } /* window->counter can't be 0 -- it is either >0 or * IWL_RATE_MAX_WINDOW */ window->success_ratio = 12800 * window->success_counter / window->counter; /* Tag this window as having been updated */ window->stamp = jiffies; spin_unlock_irqrestore(&rs_sta->lock, flags); } } static void rs_rate_init(void *priv, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta) { struct iwl3945_rs_sta *rs_sta = priv_sta; int i; IWL_DEBUG_RATE("enter\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.. */ for (i = IWL_RATE_COUNT - 1; i >= 0; i--) { if (sta->supp_rates[sband->band] & (1 << i)) { rs_sta->last_txrate_idx = i; break; } } /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ if (sband->band == IEEE80211_BAND_5GHZ) rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; IWL_DEBUG_RATE("leave\n"); } static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) { return hw->priv; } /* rate scale requires free function to be implemented */ static void rs_free(void *priv) { return; } static void rs_clear(void *priv) { return; } static void *rs_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) { struct iwl3945_rs_sta *rs_sta; struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; int i; /* * XXX: If it's using sta->drv_priv anyway, it might * as well just put all the information there. */ IWL_DEBUG_RATE("enter\n"); rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp); if (!rs_sta) { IWL_DEBUG_RATE("leave: ENOMEM\n"); return NULL; } psta->rs_sta = rs_sta; spin_lock_init(&rs_sta->lock); rs_sta->start_rate = IWL_RATE_INVALID; /* default to just 802.11b */ rs_sta->expected_tpt = iwl3945_expected_tpt_b; rs_sta->last_partial_flush = jiffies; rs_sta->last_flush = jiffies; rs_sta->flush_time = IWL_RATE_FLUSH; rs_sta->last_tx_packets = 0; rs_sta->ibss_sta_added = 0; init_timer(&rs_sta->rate_scale_flush); rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush; for (i = 0; i < IWL_RATE_COUNT; i++) iwl3945_clear_window(&rs_sta->win[i]); IWL_DEBUG_RATE("leave\n"); return rs_sta; } static void rs_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) { struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; struct iwl3945_rs_sta *rs_sta = priv_sta; psta->rs_sta = NULL; IWL_DEBUG_RATE("enter\n"); del_timer_sync(&rs_sta->rate_scale_flush); kfree(rs_sta); IWL_DEBUG_RATE("leave\n"); } /* * get ieee prev rate from rate scale table. * for A and B mode we need to overright prev * value */ static int rs_adjust_next_rate(struct iwl3945_priv *priv, int rate) { int next_rate = iwl3945_get_prev_ieee_rate(rate); switch (priv->band) { case IEEE80211_BAND_5GHZ: if (rate == IWL_RATE_12M_INDEX) next_rate = IWL_RATE_9M_INDEX; else if (rate == IWL_RATE_6M_INDEX) next_rate = IWL_RATE_6M_INDEX; break; /* XXX cannot be invoked in current mac80211 so not a regression case MODE_IEEE80211B: if (rate == IWL_RATE_11M_INDEX_TABLE) next_rate = IWL_RATE_5M_INDEX_TABLE; break; */ default: break; } return next_rate; } /** * rs_tx_status - Update rate control values based on Tx results * * NOTE: Uses iwl3945_priv->retry_rate for the # of retries attempted by * the hardware for each rate. */ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta, struct sk_buff *skb) { u8 retries, current_count; int scale_rate_index, first_index, last_index; unsigned long flags; struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate; struct iwl3945_rs_sta *rs_sta = priv_sta; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); IWL_DEBUG_RATE("enter\n"); retries = info->status.retry_count; first_index = sband->bitrates[info->tx_rate_idx].hw_value; if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) { IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index); return; } if (!priv_sta) { IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); return; } rs_sta->tx_packets++; scale_rate_index = first_index; last_index = first_index; /* * Update the window 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 * priv value 'retry_rate' vs. rate specific * * On exit from this while loop last_index indicates the rate * at which the frame was finally transmitted (or failed if no * ACK) */ while (retries > 0) { if (retries < priv->retry_rate) { current_count = retries; last_index = scale_rate_index; } else { current_count = priv->retry_rate; last_index = rs_adjust_next_rate(priv, scale_rate_index); } /* Update this rate accounting for as many retries * as was used for it (per current_count) */ iwl3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_index], 0, current_count); IWL_DEBUG_RATE("Update rate %d for %d retries.\n", scale_rate_index, current_count); retries -= current_count; if (retries) scale_rate_index = rs_adjust_next_rate(priv, scale_rate_index); } /* Update the last index window with success/failure based on ACK */ IWL_DEBUG_RATE("Update rate %d with %s.\n", last_index, (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure"); iwl3945_collect_tx_data(rs_sta, &rs_sta->win[last_index], info->flags & IEEE80211_TX_STAT_ACK, 1); /* We updated the rate scale window -- 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_partial_flush + rs_sta->flush_time)) { rs_sta->flush_pending = 1; mod_timer(&rs_sta->rate_scale_flush, jiffies + rs_sta->flush_time); } spin_unlock_irqrestore(&rs_sta->lock, flags); IWL_DEBUG_RATE("leave\n"); return; } static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, u8 index, u16 rate_mask, enum ieee80211_band band) { u8 high = IWL_RATE_INVALID; u8 low = IWL_RATE_INVALID; /* 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 = 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) { if (rs_sta->tgg) low = iwl3945_rates[low].prev_rs_tgg; else low = iwl3945_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) { if (rs_sta->tgg) high = iwl3945_rates[high].next_rs_tgg; else high = iwl3945_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; } /** * 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 index obtained below into the hw_mode's * rate table and must reference the driver allocated rate table * */ static void rs_get_rate(void *priv_r, struct ieee80211_supported_band *sband, struct ieee80211_sta *sta, void *priv_sta, struct sk_buff *skb, struct rate_selection *sel) { u8 low = IWL_RATE_INVALID; u8 high = IWL_RATE_INVALID; u16 high_low; int index; struct iwl3945_rs_sta *rs_sta = priv_sta; struct iwl3945_rate_scale_data *window = NULL; int current_tpt = IWL_INV_TPT; int low_tpt = IWL_INV_TPT; int high_tpt = IWL_INV_TPT; u32 fail_count; s8 scale_action = 0; unsigned long flags; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; u16 fc; u16 rate_mask = 0; struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r; DECLARE_MAC_BUF(mac); IWL_DEBUG_RATE("enter\n"); if (sta) rate_mask = sta->supp_rates[sband->band]; /* Send management frames and broadcast/multicast data using lowest * rate. */ fc = le16_to_cpu(hdr->frame_control); if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || is_multicast_ether_addr(hdr->addr1) || !sta || !priv_sta) { IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); if (!rate_mask) sel->rate_idx = rate_lowest_index(sband, NULL); else sel->rate_idx = rate_lowest_index(sband, sta); return; } index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1); if (sband->band == IEEE80211_BAND_5GHZ) rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && !rs_sta->ibss_sta_added) { u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1); if (sta_id == IWL_INVALID_STATION) { IWL_DEBUG_RATE("LQ: ADD station %s\n", print_mac(mac, hdr->addr1)); sta_id = iwl3945_add_station(priv, hdr->addr1, 0, CMD_ASYNC); } if (sta_id != IWL_INVALID_STATION) rs_sta->ibss_sta_added = 1; } spin_lock_irqsave(&rs_sta->lock, flags); if (rs_sta->start_rate != IWL_RATE_INVALID) { index = rs_sta->start_rate; rs_sta->start_rate = IWL_RATE_INVALID; } window = &(rs_sta->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))) { window->average_tpt = IWL_INV_TPT; spin_unlock_irqrestore(&rs_sta->lock, flags); IWL_DEBUG_RATE("Invalid average_tpt on rate %d: " "counter: %d, success_counter: %d, " "expected_tpt is %sNULL\n", index, window->counter, window->success_counter, rs_sta->expected_tpt ? "not " : ""); goto out; } window->average_tpt = ((window->success_ratio * rs_sta->expected_tpt[index] + 64) / 128); current_tpt = window->average_tpt; high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, sband->band); low = high_low & 0xff; high = (high_low >> 8) & 0xff; if (low != IWL_RATE_INVALID) low_tpt = rs_sta->win[low].average_tpt; if (high != IWL_RATE_INVALID) high_tpt = rs_sta->win[high].average_tpt; spin_unlock_irqrestore(&rs_sta->lock, flags); scale_action = 1; if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); scale_action = -1; } else if ((low_tpt == IWL_INV_TPT) && (high_tpt == IWL_INV_TPT)) scale_action = 1; else if ((low_tpt != IWL_INV_TPT) && (high_tpt != IWL_INV_TPT) && (low_tpt < current_tpt) && (high_tpt < current_tpt)) { IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < " "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt); scale_action = 0; } else { if (high_tpt != IWL_INV_TPT) { 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_INV_TPT) { if (low_tpt > current_tpt) { IWL_DEBUG_RATE ("decrease rate because of low tpt\n"); scale_action = -1; } else scale_action = 1; } } if ((window->success_ratio > IWL_RATE_HIGH_TH) || (current_tpt > window->average_tpt)) { IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or " "current_tpt [%d] > average_tpt [%d]\n", window->success_ratio, current_tpt, window->average_tpt); scale_action = 0; } switch (scale_action) { case -1: if (low != IWL_RATE_INVALID) index = low; break; case 1: if (high != IWL_RATE_INVALID) index = high; break; case 0: default: break; } IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n", index, scale_action, low, high); out: rs_sta->last_txrate_idx = index; if (sband->band == IEEE80211_BAND_5GHZ) sel->rate_idx = rs_sta->last_txrate_idx - IWL_FIRST_OFDM_RATE; else sel->rate_idx = rs_sta->last_txrate_idx; IWL_DEBUG_RATE("leave: %d\n", index); } 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, }; void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) { struct iwl3945_priv *priv = hw->priv; s32 rssi = 0; unsigned long flags; struct iwl3945_rs_sta *rs_sta; struct ieee80211_sta *sta; struct iwl3945_sta_priv *psta; IWL_DEBUG_RATE("enter\n"); rcu_read_lock(); sta = ieee80211_find_sta(hw, priv->stations[sta_id].sta.sta.addr); psta = (void *) sta->drv_priv; if (!sta || !psta) { IWL_DEBUG_RATE("leave - no private rate data!\n"); rcu_read_unlock(); return; } rs_sta = psta->rs_sta; spin_lock_irqsave(&rs_sta->lock, flags); rs_sta->tgg = 0; switch (priv->band) { case IEEE80211_BAND_2GHZ: /* TODO: this always does G, not a regression */ if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { rs_sta->tgg = 1; rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; } else rs_sta->expected_tpt = iwl3945_expected_tpt_g; break; case IEEE80211_BAND_5GHZ: rs_sta->expected_tpt = iwl3945_expected_tpt_a; break; case IEEE80211_NUM_BANDS: BUG(); break; } rcu_read_unlock(); spin_unlock_irqrestore(&rs_sta->lock, flags); rssi = priv->last_rx_rssi; if (rssi == 0) rssi = IWL_MIN_RSSI_VAL; IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi); rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); IWL_DEBUG_RATE("leave: rssi %d assign rate index: " "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, iwl3945_rates[rs_sta->start_rate].plcp); } int iwl3945_rate_control_register(void) { return ieee80211_rate_control_register(&rs_ops); } void iwl3945_rate_control_unregister(void) { ieee80211_rate_control_unregister(&rs_ops); }