/**
* 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;
}
/*
* Called after adding a new station to initialize rate scaling
*/
void iwl3945_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
{
struct ieee80211_hw *hw = priv->hw;
struct ieee80211_conf *conf = &priv->hw->conf;
struct iwl3945_sta_priv *psta;
struct iwl3945_rs_sta *rs_sta;
struct ieee80211_supported_band *sband;
int i;
IWL_DEBUG_INFO(priv, "enter\n");
if (sta_id == priv->contexts[IWL_RXON_CTX_BSS].bcast_sta_id)
goto out;
psta = (struct iwl3945_sta_priv *) sta->drv_priv;
rs_sta = &psta->rs_sta;
sband = hw->wiphy->bands[conf->channel->band];
rs_sta->priv = priv;
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->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_3945; i++)
iwl3945_clear_window(&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;
}
}
priv->_3945.sta_supp_rates = sta->supp_rates[sband->band];
/* 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;
priv->_3945.sta_supp_rates = priv->_3945.sta_supp_rates <<
IWL_FIRST_OFDM_RATE;
}
out:
priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
IWL_DEBUG_INFO(priv, "leave\n");
}
static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
{
int unflushed = 0;
int i;
unsigned long flags;
struct iwl_priv *priv __maybe_unused = rs_sta->priv;
for (i = 0; i < IWL_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 +
IWL_RATE_WIN_FLUSH)) {
IWL_DEBUG_RATE(priv, "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;
}
static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp)
{
struct iwl3945_rs_sta *rs_sta;
struct iwl3945_sta_priv *psta = (void *) sta->drv_priv;
struct iwl_priv *priv = iwl_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(priv, "enter\n");
rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp);
if (!rs_sta) {
IWL_DEBUG_RATE(priv, "leave: ENOMEM\n");
return NULL;
}
psta->rs_sta = rs_sta;
spin_lock_init(&rs_sta->lock);
rs_sta->priv = priv;
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_3945; i++)
iwl3945_clear_window(&rs_sta->win[i]);
IWL_DEBUG_RATE(priv, "leave\n");
return rs_sta;
}
