/**
* 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)
{
s8 retries = 0, 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.rates[0].count;
first_index = sband->bitrates[info->status.rates[0].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 > 1) {
if ((retries - 1) < priv->retry_rate) {
current_count = (retries - 1);
last_index = scale_rate_index;
} else {
current_count = priv->retry_rate;
last_index = iwl3945_rs_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, scale_rate_index);
IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
scale_rate_index, current_count);
retries -= current_count;
scale_rate_index = last_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, last_index);
/* 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_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);
IWL_DEBUG_RATE("leave\n");
return;
}
static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta,
struct sk_buff *skb)
{
s8 retries = 0, current_count;
int scale_rate_index, first_index, last_index;
unsigned long flags;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl3945_rs_sta *rs_sta = priv_sta;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
IWL_DEBUG_RATE(priv, "enter\n");
retries = info->status.rates[0].count;
if (retries > IWL_RATE_RETRY_TH)
retries = IWL_RATE_RETRY_TH;
first_index = sband->bitrates[info->status.rates[0].idx].hw_value;
if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) {
IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index);
return;
}
if (!priv_sta) {
IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n");
return;
}
rs_sta->tx_packets++;
scale_rate_index = first_index;
last_index = first_index;
while (retries > 1) {
if ((retries - 1) < priv->retry_rate) {
current_count = (retries - 1);
last_index = scale_rate_index;
} else {
current_count = priv->retry_rate;
last_index = iwl3945_rs_next_rate(priv,
scale_rate_index);
}
iwl3945_collect_tx_data(rs_sta,
&rs_sta->win[scale_rate_index],
0, current_count, scale_rate_index);
IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n",
scale_rate_index, current_count);
retries -= current_count;
scale_rate_index = last_index;
}
IWL_DEBUG_RATE(priv, "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, last_index);
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);
IWL_DEBUG_RATE(priv, "leave\n");
return;
}
