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- /******************************************************************************
- *
- * 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 <ilw@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/slab.h>
- #include <net/mac80211.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/delay.h>
- #include <linux/workqueue.h>
- #include "commands.h"
- #include "3945.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->hw_params.bcast_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_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)
- {
- }
- 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 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 = simple_open,
- .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->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->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);
- }
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