static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta)
{
struct iwl3945_rs_sta *rs_sta = priv_sta;
struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r;
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 = sband->n_bitrates - 1; i >= 0; i--) {
if (sta->supp_rates[sband->band] & (1 << i)) {
rs_sta->last_txrate_idx = i;
break;
}
}
priv->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->sta_supp_rates = priv->sta_supp_rates <<
IWL_FIRST_OFDM_RATE;
}
IWL_DEBUG_RATE("leave\n");
}
static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta)
{
struct iwl3945_rs_sta *rs_sta = priv_sta;
struct iwl_priv *priv = (struct iwl_priv *)priv_r;
int i;
IWL_DEBUG_RATE(priv, "enter\n");
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->sta_supp_rates = sta->supp_rates[sband->band];
if (sband->band == IEEE80211_BAND_5GHZ) {
rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
priv->sta_supp_rates = priv->sta_supp_rates <<
IWL_FIRST_OFDM_RATE;
}
IWL_DEBUG_RATE(priv, "leave\n");
}
static void iwl_legacy_dump_lq_cmd(struct iwl_priv *priv,
struct iwl_link_quality_cmd *lq)
{
int i;
IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
lq->general_params.single_stream_ant_msk,
lq->general_params.dual_stream_ant_msk);
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
i, lq->rs_table[i].rate_n_flags);
}
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");
}
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;
}
/**
* Program the device to use fixed rate for frame transmit
* This is for debugging/testing only
* once the device start use fixed rate, we need to reload the module
* to being back the normal operation.
*/
static void rs_program_fix_rate(struct iwl_priv *priv,
struct iwl_lq_sta *lq_sta)
{
struct iwl_station_priv *sta_priv =
container_of(lq_sta, struct iwl_station_priv, lq_sta);
struct iwl_rxon_context *ctx = sta_priv->ctx;
lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
#ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
/* testmode has higher priority to overwirte the fixed rate */
if (priv->tm_fixed_rate)
lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
#endif
IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
if (lq_sta->dbg_fixed_rate) {
rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
false);
}
}
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;
}
/**
* 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;
}
void iwl_set_rate(struct iwl_priv *priv)
{
const struct ieee80211_supported_band *hw = NULL;
struct ieee80211_rate *rate;
struct iwl_rxon_context *ctx;
int i;
hw = iwl_get_hw_mode(priv, priv->band);
if (!hw) {
IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
return;
}
priv->active_rate = 0;
for (i = 0; i < hw->n_bitrates; i++) {
rate = &(hw->bitrates[i]);
if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
priv->active_rate |= (1 << rate->hw_value);
}
IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
for_each_context(priv, ctx) {
ctx->staging.cck_basic_rates =
(IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
ctx->staging.ofdm_basic_rates =
(IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
}
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 __maybe_unused = iwl_priv;
IWL_DEBUG_RATE(priv, "enter\n");
rs_sta = &psta->rs_sta;
spin_lock_init(&rs_sta->lock);
init_timer(&rs_sta->rate_scale_flush);
IWL_DEBUG_RATE(priv, "leave\n");
return rs_sta;
}
/**
* 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, int index)
{
unsigned long flags;
s32 fail_count;
if (!retries) {
IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
return;
}
spin_lock_irqsave(&rs_sta->lock, flags);
while (retries--) {
/* 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;
}
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 = ((window->success_ratio *
rs_sta->expected_tpt[index] + 64) / 128);
else
window->average_tpt = IWL_INV_TPT;
spin_unlock_irqrestore(&rs_sta->lock, flags);
}
/**
* 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 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);
/* 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);
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_AVERAGE_PACKETS * 1000) / pps;
if (duration < IWL_RATE_FLUSH_MIN)
duration = IWL_RATE_FLUSH_MIN;
else if (duration > IWL_RATE_FLUSH_MAX)
duration = IWL_RATE_FLUSH_MAX;
} 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;
} else {
rs_sta->flush_time = IWL_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);
IWL_DEBUG_RATE("leave\n");
}
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;
}
void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
enum ieee80211_band band)
{
int i, j;
struct ieee80211_hw *hw = mvm->hw;
struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
struct iwl_mvm_sta *sta_priv;
struct iwl_lq_sta *lq_sta;
struct ieee80211_supported_band *sband;
unsigned long supp; /* must be unsigned long for for_each_set_bit */
sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
lq_sta = &sta_priv->lq_sta;
sband = hw->wiphy->bands[band];
lq_sta->lq.sta_id = sta_priv->sta_id;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
lq_sta->flush_timer = 0;
lq_sta->supp_rates = sta->supp_rates[sband->band];
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
IWL_DEBUG_RATE(mvm,
"LQ: *** rate scale station global init for station %d ***\n",
sta_priv->sta_id);
/* 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.. */
lq_sta->max_rate_idx = -1;
lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
lq_sta->is_green = rs_use_green(sta);
lq_sta->band = sband->band;
/*
* active legacy rates as per supported rates bitmap
*/
supp = sta->supp_rates[sband->band];
lq_sta->active_legacy_rate = 0;
for_each_set_bit(i, &supp, BITS_PER_LONG)
lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
/*
* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
* supp_rates[] does not; shift to convert format, force 9 MBits off.
*/
lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
lq_sta->active_siso_rate &= ~((u16)0x2);
lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
/* Same here */
lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
lq_sta->active_mimo2_rate &= ~((u16)0x2);
lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
lq_sta->active_mimo3_rate &= ~((u16)0x2);
lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
IWL_DEBUG_RATE(mvm,
"SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
lq_sta->active_siso_rate,
lq_sta->active_mimo2_rate,
lq_sta->active_mimo3_rate);
/* These values will be overridden later */
lq_sta->lq.single_stream_ant_msk =
first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
lq_sta->lq.dual_stream_ant_msk =
iwl_fw_valid_tx_ant(mvm->fw) &
~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
if (!lq_sta->lq.dual_stream_ant_msk) {
lq_sta->lq.dual_stream_ant_msk = ANT_AB;
} else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
lq_sta->lq.dual_stream_ant_msk =
iwl_fw_valid_tx_ant(mvm->fw);
}
/* as default allow aggregation for all tids */
lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
lq_sta->drv = mvm;
/* Set last_txrate_idx to lowest rate */
lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
if (sband->band == IEEE80211_BAND_5GHZ)
lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
lq_sta->is_agg = 0;
#ifdef CONFIG_MAC80211_DEBUGFS
lq_sta->dbg_fixed_rate = 0;
#endif
rs_initialize_lq(mvm, sta, lq_sta, band);
}
static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
struct iwl3945_rate_scale_data *window,
int success, int retries, int index)
{
unsigned long flags;
s32 fail_count;
struct iwl_priv *priv __maybe_unused = rs_sta->priv;
if (!retries) {
IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n");
return;
}
spin_lock_irqsave(&rs_sta->lock, flags);
while (retries > 0) {
if (window->counter >= IWL_RATE_MAX_WINDOW) {
window->counter = IWL_RATE_MAX_WINDOW - 1;
if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) {
window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1));
window->success_counter--;
}
}
window->counter++;
window->data <<= 1;
if (success > 0) {
window->success_counter++;
window->data |= 0x1;
success--;
}
retries--;
}
if (window->counter > 0)
window->success_ratio = 128 * (100 * window->success_counter)
/ window->counter;
else
window->success_ratio = IWL_INVALID_VALUE;
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 = ((window->success_ratio *
rs_sta->expected_tpt[index] + 64) / 128);
else
window->average_tpt = IWL_INVALID_VALUE;
window->stamp = jiffies;
spin_unlock_irqrestore(&rs_sta->lock, flags);
}
static void iwl3945_bg_rate_scale_flush(unsigned long data)
{
struct iwl3945_rs_sta *rs_sta = (void *)data;
struct iwl_priv *priv __maybe_unused = rs_sta->priv;
int unflushed = 0;
unsigned long flags;
u32 packet_count, duration, pps;
IWL_DEBUG_RATE(priv, "enter\n");
unflushed = iwl3945_rate_scale_flush_windows(rs_sta);
spin_lock_irqsave(&rs_sta->lock, flags);
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);
IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n",
packet_count, duration);
if (duration)
pps = (packet_count * 1000) / duration;
else
pps = 0;
if (pps) {
duration = (IWL_AVERAGE_PACKETS * 1000) / pps;
if (duration < IWL_RATE_FLUSH_MIN)
duration = IWL_RATE_FLUSH_MIN;
else if (duration > IWL_RATE_FLUSH_MAX)
duration = IWL_RATE_FLUSH_MAX;
} else
duration = IWL_RATE_FLUSH_MAX;
rs_sta->flush_time = msecs_to_jiffies(duration);
IWL_DEBUG_RATE(priv, "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 = IWL_RATE_FLUSH;
rs_sta->flush_pending = 0;
}
rs_sta->last_flush = jiffies;
spin_unlock_irqrestore(&rs_sta->lock, flags);
IWL_DEBUG_RATE(priv, "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, int index)
{
unsigned long flags;
s32 fail_count;
struct iwl_priv *priv __maybe_unused = rs_sta->priv;
if (!retries) {
IWL_DEBUG_RATE(priv, "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 window; anything older isn't really relevant any more.
* If we have filled up the sliding window, 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 (window->counter >= IWL_RATE_MAX_WINDOW) {
/* remove earliest */
window->counter = IWL_RATE_MAX_WINDOW - 1;
if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) {
window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1));
window->success_counter--;
}
}
/* Increment frames-attempted counter */
window->counter++;
/* Shift bitmap by one frame (throw away oldest history),
* OR in "1", and increment "success" if this
* frame was successful. */
window->data <<= 1;
if (success > 0) {
window->success_counter++;
window->data |= 0x1;
success--;
}
retries--;
}
/* Calculate current success ratio, avoid divide-by-0! */
if (window->counter > 0)
window->success_ratio = 128 * (100 * window->success_counter)
/ window->counter;
else
window->success_ratio = IWL_INVALID_VALUE;
fail_count = window->counter - window->success_counter;
/* Calculate average throughput, if we have enough history. */
if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
window->average_tpt = ((window->success_ratio *
rs_sta->expected_tpt[index] + 64) / 128);
else
window->average_tpt = IWL_INVALID_VALUE;
/* Tag this window as having been updated */
window->stamp = jiffies;
spin_unlock_irqrestore(&rs_sta->lock, flags);
}
