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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [net/] [wireless/] [iwlwifi/] [iwl-3945-rs.c] - Blame information for rev 62

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/******************************************************************************
 *
 * 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>
 
#define IWL 3945
 
#include "../net/mac80211/ieee80211_rate.h"
 
#include "iwlwifi.h"
 
#define RS_NAME "iwl-3945-rs"
 
struct iwl_rate_scale_data {
        u64 data;
        s32 success_counter;
        s32 success_ratio;
        s32 counter;
        s32 average_tpt;
        unsigned long stamp;
};
 
struct iwl_rate_scale_priv {
        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 iwl_rate_scale_data win[IWL_RATE_COUNT];
};
 
static s32 iwl_expected_tpt_g[IWL_RATE_COUNT] = {
        7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
};
 
static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
        7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
};
 
static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
        0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
};
 
static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
        7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
};
 
struct iwl_tpt_entry {
        s8 min_rssi;
        u8 index;
};
 
static struct iwl_tpt_entry iwl_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 iwl_tpt_entry iwl_tpt_table_b[] = {
        {-86, IWL_RATE_11M_INDEX},
        {-88, IWL_RATE_5M_INDEX},
        {-90, IWL_RATE_2M_INDEX},
        {-92, IWL_RATE_1M_INDEX}
 
};
 
static struct iwl_tpt_entry iwl_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 iwl_get_rate_index_by_rssi(s32 rssi, u8 mode)
{
        u32 index = 0;
        u32 table_size = 0;
        struct iwl_tpt_entry *tpt_table = NULL;
 
        if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
                rssi = IWL_MIN_RSSI_VAL;
 
        switch (mode) {
        case MODE_IEEE80211G:
                tpt_table = iwl_tpt_table_g;
                table_size = ARRAY_SIZE(iwl_tpt_table_g);
                break;
 
        case MODE_IEEE80211A:
                tpt_table = iwl_tpt_table_a;
                table_size = ARRAY_SIZE(iwl_tpt_table_a);
                break;
 
        default:
        case MODE_IEEE80211B:
                tpt_table = iwl_tpt_table_b;
                table_size = ARRAY_SIZE(iwl_tpt_table_b);
                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 iwl_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;
}
 
/**
 * iwl_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 iwl_rate_scale_flush_windows(struct iwl_rate_scale_priv *rs_priv)
{
        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_priv->win[i].counter)
                        continue;
 
                spin_lock_irqsave(&rs_priv->lock, flags);
                if (time_after(jiffies, rs_priv->win[i].stamp +
                               IWL_RATE_WIN_FLUSH)) {
                        IWL_DEBUG_RATE("flushing %d samples of rate "
                                       "index %d\n",
                                       rs_priv->win[i].counter, i);
                        iwl_clear_window(&rs_priv->win[i]);
                } else
                        unflushed++;
                spin_unlock_irqrestore(&rs_priv->lock, flags);
        }
 
        return unflushed;
}
 
#define IWL_RATE_FLUSH_MAX              5000    /* msec */
#define IWL_RATE_FLUSH_MIN              50      /* msec */
 
static void iwl_bg_rate_scale_flush(unsigned long data)
{
        struct iwl_rate_scale_priv *rs_priv = (void *)data;
        int unflushed = 0;
        unsigned long flags;
        u32 packet_count, duration, pps;
 
        IWL_DEBUG_RATE("enter\n");
 
        unflushed = iwl_rate_scale_flush_windows(rs_priv);
 
        spin_lock_irqsave(&rs_priv->lock, flags);
 
        rs_priv->flush_pending = 0;
 
        /* Number of packets Rx'd since last time this timer ran */
        packet_count = (rs_priv->tx_packets - rs_priv->last_tx_packets) + 1;
 
        rs_priv->last_tx_packets = rs_priv->tx_packets + 1;
 
        if (unflushed) {
                duration =
                    jiffies_to_msecs(jiffies - rs_priv->last_partial_flush);
/*              duration = jiffies_to_msecs(rs_priv->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_priv->flush_time = msecs_to_jiffies(duration);
 
                IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
                               duration, packet_count);
 
                mod_timer(&rs_priv->rate_scale_flush, jiffies +
                          rs_priv->flush_time);
 
                rs_priv->last_partial_flush = jiffies;
        }
 
        /* If there weren't any unflushed entries, we don't schedule the timer
         * to run again */
 
        rs_priv->last_flush = jiffies;
 
        spin_unlock_irqrestore(&rs_priv->lock, flags);
 
        IWL_DEBUG_RATE("leave\n");
}
 
/**
 * iwl_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 iwl_collect_tx_data(struct iwl_rate_scale_priv *rs_priv,
                                struct iwl_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_priv->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_priv->lock, flags);
        }
}
 
static void rs_rate_init(void *priv_rate, void *priv_sta,
                         struct ieee80211_local *local, struct sta_info *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 & (1 << i)) {
                        sta->txrate = i;
                        break;
                }
        }
 
        sta->last_txrate = sta->txrate;
 
        /* For MODE_IEEE80211A mode it start at IWL_FIRST_OFDM_RATE */
        if (local->hw.conf.phymode == MODE_IEEE80211A)
                sta->last_txrate += IWL_FIRST_OFDM_RATE;
 
        IWL_DEBUG_RATE("leave\n");
}
 
static void *rs_alloc(struct ieee80211_local *local)
{
        return local->hw.priv;
}
 
/* rate scale requires free function to be implmented */
static void rs_free(void *priv)
{
        return;
}
static void rs_clear(void *priv)
{
        return;
}
 
 
static void *rs_alloc_sta(void *priv, gfp_t gfp)
{
        struct iwl_rate_scale_priv *rs_priv;
        int i;
 
        IWL_DEBUG_RATE("enter\n");
 
        rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
        if (!rs_priv) {
                IWL_DEBUG_RATE("leave: ENOMEM\n");
                return NULL;
        }
 
        spin_lock_init(&rs_priv->lock);
 
        rs_priv->start_rate = IWL_RATE_INVALID;
 
        /* default to just 802.11b */
        rs_priv->expected_tpt = iwl_expected_tpt_b;
 
        rs_priv->last_partial_flush = jiffies;
        rs_priv->last_flush = jiffies;
        rs_priv->flush_time = IWL_RATE_FLUSH;
        rs_priv->last_tx_packets = 0;
        rs_priv->ibss_sta_added = 0;
 
        init_timer(&rs_priv->rate_scale_flush);
        rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
        rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
 
        for (i = 0; i < IWL_RATE_COUNT; i++)
                iwl_clear_window(&rs_priv->win[i]);
 
        IWL_DEBUG_RATE("leave\n");
 
        return rs_priv;
}
 
static void rs_free_sta(void *priv, void *priv_sta)
{
        struct iwl_rate_scale_priv *rs_priv = priv_sta;
 
        IWL_DEBUG_RATE("enter\n");
        del_timer_sync(&rs_priv->rate_scale_flush);
        kfree(rs_priv);
        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 iwl_priv *priv, int rate)
{
        int next_rate = iwl_get_prev_ieee_rate(rate);
 
        switch (priv->phymode) {
        case MODE_IEEE80211A:
                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;
        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 iwl_priv->retry_rate for the # of retries attempted by
 * the hardware for each rate.
 */
static void rs_tx_status(void *priv_rate,
                         struct net_device *dev,
                         struct sk_buff *skb,
                         struct ieee80211_tx_status *tx_resp)
{
        u8 retries, current_count;
        int scale_rate_index, first_index, last_index;
        unsigned long flags;
        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_priv *rs_priv;
 
        IWL_DEBUG_RATE("enter\n");
 
        retries = tx_resp->retry_count;
 
        first_index = tx_resp->control.tx_rate;
        if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
                IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
                               tx_resp->control.tx_rate, first_index);
                return;
        }
 
        sta = sta_info_get(local, hdr->addr1);
        if (!sta || !sta->rate_ctrl_priv) {
                if (sta)
                        sta_info_put(sta);
                IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
                return;
        }
 
        rs_priv = (void *)sta->rate_ctrl_priv;
 
        rs_priv->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) */
                iwl_collect_tx_data(rs_priv,
                                    &rs_priv->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,
                       (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
                       "success" : "failure");
        iwl_collect_tx_data(rs_priv,
                            &rs_priv->win[last_index],
                            tx_resp->flags & IEEE80211_TX_STATUS_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_priv->lock, flags);
 
        if (!rs_priv->flush_pending &&
            time_after(jiffies, rs_priv->last_partial_flush +
                       rs_priv->flush_time)) {
 
                rs_priv->flush_pending = 1;
                mod_timer(&rs_priv->rate_scale_flush,
                          jiffies + rs_priv->flush_time);
        }
 
        spin_unlock_irqrestore(&rs_priv->lock, flags);
 
        sta_info_put(sta);
 
        IWL_DEBUG_RATE("leave\n");
 
        return;
}
 
static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
                                                  *local)
{
        struct ieee80211_hw_mode *mode = local->oper_hw_mode;
        int i;
 
        for (i = 0; i < mode->num_rates; i++) {
                struct ieee80211_rate *rate = &mode->rates[i];
 
                if (rate->flags & IEEE80211_RATE_SUPPORTED)
                        return rate;
        }
 
        return &mode->rates[0];
}
 
static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
                                 u8 index, u16 rate_mask, int phymode)
{
        u8 high = IWL_RATE_INVALID;
        u8 low = IWL_RATE_INVALID;
 
        /* 802.11A walks to the next literal adjascent rate in
         * the rate table */
        if (unlikely(phymode == MODE_IEEE80211A)) {
                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_priv->tgg)
                        low = iwl_rates[low].prev_rs_tgg;
                else
                        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) {
                if (rs_priv->tgg)
                        high = iwl_rates[high].next_rs_tgg;
                else
                        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;
}
 
/**
 * 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 struct ieee80211_rate *rs_get_rate(void *priv_rate,
                                          struct net_device *dev,
                                          struct sk_buff *skb,
                                          struct rate_control_extra *extra)
{
        u8 low = IWL_RATE_INVALID;
        u8 high = IWL_RATE_INVALID;
        u16 high_low;
        int index;
        struct iwl_rate_scale_priv *rs_priv;
        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;
        unsigned long flags;
        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
        struct sta_info *sta;
        u16 fc, rate_mask;
        struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
        DECLARE_MAC_BUF(mac);
 
        IWL_DEBUG_RATE("enter\n");
 
        memset(extra, 0, sizeof(*extra));
 
        fc = le16_to_cpu(hdr->frame_control);
        if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
            (is_multicast_ether_addr(hdr->addr1))) {
                /* Send management frames and broadcast/multicast data using
                 * lowest rate. */
                /* TODO: this could probably be improved.. */
                IWL_DEBUG_RATE("leave: lowest rate (not data or is "
                               "multicast)\n");
 
                return iwl_get_lowest_rate(local);
        }
 
        sta = sta_info_get(local, hdr->addr1);
        if (!sta || !sta->rate_ctrl_priv) {
                IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
                if (sta)
                        sta_info_put(sta);
                return NULL;
        }
 
        rate_mask = sta->supp_rates;
        index = min(sta->last_txrate & 0xffff, IWL_RATE_COUNT - 1);
 
        if (priv->phymode == (u8) MODE_IEEE80211A)
                rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
 
        rs_priv = (void *)sta->rate_ctrl_priv;
 
        if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
            !rs_priv->ibss_sta_added) {
                u8 sta_id = iwl_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 = iwl_add_station(priv,
                                    hdr->addr1, 0, CMD_ASYNC);
                }
                if (sta_id != IWL_INVALID_STATION)
                        rs_priv->ibss_sta_added = 1;
        }
 
        spin_lock_irqsave(&rs_priv->lock, flags);
 
        if (rs_priv->start_rate != IWL_RATE_INVALID) {
                index = rs_priv->start_rate;
                rs_priv->start_rate = IWL_RATE_INVALID;
        }
 
        window = &(rs_priv->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_INVALID_VALUE;
                spin_unlock_irqrestore(&rs_priv->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_priv->expected_tpt ? "not " : "");
                goto out;
 
        }
 
        window->average_tpt = ((window->success_ratio *
                                rs_priv->expected_tpt[index] + 64) / 128);
        current_tpt = window->average_tpt;
 
        high_low = iwl_get_adjacent_rate(rs_priv, index, rate_mask,
                                         local->hw.conf.phymode);
        low = high_low & 0xff;
        high = (high_low >> 8) & 0xff;
 
        if (low != IWL_RATE_INVALID)
                low_tpt = rs_priv->win[low].average_tpt;
 
        if (high != IWL_RATE_INVALID)
                high_tpt = rs_priv->win[high].average_tpt;
 
        spin_unlock_irqrestore(&rs_priv->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_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)) {
                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_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 ((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:
 
        sta->last_txrate = index;
        if (priv->phymode == (u8) MODE_IEEE80211A)
                sta->txrate = sta->last_txrate - IWL_FIRST_OFDM_RATE;
        else
                sta->txrate = sta->last_txrate;
 
        sta_info_put(sta);
 
        IWL_DEBUG_RATE("leave: %d\n", index);
 
        return &priv->ieee_rates[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,
};
 
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;
        unsigned long flags;
        int count = 0, i;
        u32 samples = 0, success = 0, good = 0;
        unsigned long now = jiffies;
        u32 max_time = 0;
 
        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;
        spin_lock_irqsave(&rs_priv->lock, flags);
        i = IWL_RATE_54M_INDEX;
        while (1) {
                u64 mask;
                int j;
 
                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->win[i].data & mask) ? '1' : '0';
 
                samples += rs_priv->win[i].counter;
                good += rs_priv->win[i].success_counter;
                success += rs_priv->win[i].success_counter * iwl_rates[i].ieee;
 
                if (rs_priv->win[i].stamp) {
                        int delta =
                            jiffies_to_msecs(now - rs_priv->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;
        }
        spin_unlock_irqrestore(&rs_priv->lock, flags);
        sta_info_put(sta);
 
        /* 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");
 
        return count;
}
 
void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
{
        struct iwl_priv *priv = hw->priv;
        s32 rssi = 0;
        unsigned long flags;
        struct ieee80211_local *local = hw_to_local(hw);
        struct iwl_rate_scale_priv *rs_priv;
        struct sta_info *sta;
 
        IWL_DEBUG_RATE("enter\n");
 
        if (!local->rate_ctrl->ops->name ||
            strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
                IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
                IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
                return;
        }
 
        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");
                return;
        }
 
        rs_priv = (void *)sta->rate_ctrl_priv;
 
        spin_lock_irqsave(&rs_priv->lock, flags);
 
        rs_priv->tgg = 0;
        switch (priv->phymode) {
        case MODE_IEEE80211G:
                if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
                        rs_priv->tgg = 1;
                        rs_priv->expected_tpt = iwl_expected_tpt_g_prot;
                } else
                        rs_priv->expected_tpt = iwl_expected_tpt_g;
                break;
 
        case MODE_IEEE80211A:
                rs_priv->expected_tpt = iwl_expected_tpt_a;
                break;
 
        default:
                IWL_WARNING("Invalid phymode.  Defaulting to 802.11b\n");
        case MODE_IEEE80211B:
                rs_priv->expected_tpt = iwl_expected_tpt_b;
                break;
        }
 
        sta_info_put(sta);
        spin_unlock_irqrestore(&rs_priv->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_priv->start_rate = iwl_get_rate_index_by_rssi(rssi, priv->phymode);
 
        IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
                       "%d (plcp 0x%x)\n", rssi, rs_priv->start_rate,
                       iwl_rates[rs_priv->start_rate].plcp);
}
 
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);
}
 
 
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [net/] [wireless/] [iwlwifi/] [iwl-3945-rs.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/******************************************************************************`
2			`*`
3			`* Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.`
4			`*`
5			`* This program is free software; you can redistribute it and/or modify it`
6			`* under the terms of version 2 of the GNU General Public License as`
7			`* published by the Free Software Foundation.`
8			`*`
9			`* This program is distributed in the hope that it will be useful, but WITHOUT`
10			`* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
11			`* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
12			`* more details.`
13			`*`
14			`* You should have received a copy of the GNU General Public License along with`
15			`* this program; if not, write to the Free Software Foundation, Inc.,`
16			`* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA`
17			`*`
18			`* The full GNU General Public License is included in this distribution in the`
19			`* file called LICENSE.`
20			`*`
21			`* Contact Information:`
22			`* James P. Ketrenos <ipw2100-admin@linux.intel.com>`
23			`* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497`
24			`*`
25			`*****************************************************************************/`
26
27			`#include <linux/kernel.h>`
28			`#include <linux/init.h>`
29			`#include <linux/skbuff.h>`
30			`#include <linux/wireless.h>`
31			`#include <net/mac80211.h>`
32			`#include <net/ieee80211.h>`
33
34			`#include <linux/netdevice.h>`
35			`#include <linux/etherdevice.h>`
36			`#include <linux/delay.h>`
37
38			`#include <linux/workqueue.h>`
39
40			`#define IWL 3945`