/* Adjust the rate while ensuring that we won't switch to a lower rate if it
* exhibited a worse failed frames behaviour and we'll choose the highest rate
* whose failed frames behaviour is not worse than the one of the original rate
* target. While at it, check that the new rate is valid. */
static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
struct sta_info *sta, int adj,
struct rc_pid_rateinfo *rinfo)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_supported_band *sband;
int cur_sorted, new_sorted, probe, tmp, n_bitrates, band;
int cur = sta->txrate_idx;
sdata = sta->sdata;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
band = sband->band;
n_bitrates = sband->n_bitrates;
/* Map passed arguments to sorted values. */
cur_sorted = rinfo[cur].rev_index;
new_sorted = cur_sorted + adj;
/* Check limits. */
if (new_sorted < 0)
new_sorted = rinfo[0].rev_index;
else if (new_sorted >= n_bitrates)
new_sorted = rinfo[n_bitrates - 1].rev_index;
tmp = new_sorted;
if (adj < 0) {
/* Ensure that the rate decrease isn't disadvantageous. */
for (probe = cur_sorted; probe >= new_sorted; probe--)
if (rinfo[probe].diff <= rinfo[cur_sorted].diff &&
rate_supported(sta, band, rinfo[probe].index))
tmp = probe;
} else {
/* Look for rate increase with zero (or below) cost. */
for (probe = new_sorted + 1; probe < n_bitrates; probe++)
if (rinfo[probe].diff <= rinfo[new_sorted].diff &&
rate_supported(sta, band, rinfo[probe].index))
tmp = probe;
}
/* Fit the rate found to the nearest supported rate. */
do {
if (rate_supported(sta, band, rinfo[tmp].index)) {
sta->txrate_idx = rinfo[tmp].index;
break;
}
if (adj < 0)
tmp--;
else
tmp++;
} while (tmp < n_bitrates && tmp >= 0);
#ifdef CONFIG_MAC80211_DEBUGFS
rate_control_pid_event_rate_change(
&((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events,
sta->txrate_idx, sband->bitrates[sta->txrate_idx].bitrate);
#endif
}
/* Adjust the rate while ensuring that we won't switch to a lower rate if it
* exhibited a worse failed frames behaviour and we'll choose the highest rate
* whose failed frames behaviour is not worse than the one of the original rate
* target. While at it, check that the new rate is valid. */
static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
struct sta_info *sta, int adj,
struct rc_pid_rateinfo *rinfo)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hw_mode *mode;
int cur_sorted, new_sorted, probe, tmp, n_bitrates;
int cur = sta->txrate;
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
mode = local->oper_hw_mode;
n_bitrates = mode->num_rates;
/* Map passed arguments to sorted values. */
cur_sorted = rinfo[cur].rev_index;
new_sorted = cur_sorted + adj;
/* Check limits. */
if (new_sorted < 0)
new_sorted = rinfo[0].rev_index;
else if (new_sorted >= n_bitrates)
new_sorted = rinfo[n_bitrates - 1].rev_index;
tmp = new_sorted;
if (adj < 0) {
/* Ensure that the rate decrease isn't disadvantageous. */
for (probe = cur_sorted; probe >= new_sorted; probe--)
if (rinfo[probe].diff <= rinfo[cur_sorted].diff &&
rate_supported(sta, mode, rinfo[probe].index))
tmp = probe;
} else {
/* Look for rate increase with zero (or below) cost. */
for (probe = new_sorted + 1; probe < n_bitrates; probe++)
if (rinfo[probe].diff <= rinfo[new_sorted].diff &&
rate_supported(sta, mode, rinfo[probe].index))
tmp = probe;
}
/* Fit the rate found to the nearest supported rate. */
do {
if (rate_supported(sta, mode, rinfo[tmp].index)) {
sta->txrate = rinfo[tmp].index;
break;
}
if (adj < 0)
tmp--;
else
tmp++;
} while (tmp < n_bitrates && tmp >= 0);
#ifdef CONFIG_MAC80211_DEBUGFS
rate_control_pid_event_rate_change(
&((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events,
cur, mode->rates[cur].rate);
#endif
}
static void
minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta)
{
int i;
if (sband->band != IEEE80211_BAND_2GHZ)
return;
if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
return;
mi->cck_supported = 0;
mi->cck_supported_short = 0;
for (i = 0; i < 4; i++) {
if (!rate_supported(sta, sband->band, mp->cck_rates[i]))
continue;
mi->cck_supported |= BIT(i);
if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE)
mi->cck_supported_short |= BIT(i);
}
mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported;
}
static void rate_control_rate_dec(struct ieee80211_local *local,
struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_supported_band *sband;
int i = sta->txrate_idx;
sdata = sta->sdata;
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
/* forced unicast rate - do not change STA rate */
return;
}
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
if (i > sband->n_bitrates)
i = sband->n_bitrates;
while (i > 0) {
i--;
if (rate_supported(sta, sband->band, i)) {
sta->txrate_idx = i;
break;
}
}
}
static void rate_control_rate_inc(struct ieee80211_local *local,
struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_supported_band *sband;
int i = sta->txrate_idx;
int maxrate;
sdata = sta->sdata;
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
/* forced unicast rate - do not change STA rate */
return;
}
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
if (i > sband->n_bitrates)
i = sband->n_bitrates - 2;
while (i + 1 < sband->n_bitrates) {
i++;
if (rate_supported(sta, sband->band, i) &&
(maxrate < 0 || i <= maxrate)) {
sta->txrate_idx = i;
break;
}
}
}
static void
indra_rate_init(void *priv, struct ieee80211_supported_band *sband,
struct cfg80211_chan_def *chandef,
struct ieee80211_sta *sta, void *priv_sta)
{
struct indra_sta_info *ii = priv_sta;
struct indra_priv *ip = priv;
unsigned int i, n = 0, s, st = 0;
u32 rate_flags;
ii->sta = sta;
ii->lowest_rix = rate_lowest_index(sband, sta);
rate_flags = ieee80211_chandef_rate_flags(&ip->hw->conf.chandef);
for (i = 0; i < sband->n_bitrates; i++) {
struct indra_rate *ir = &ii->r[n];
if (!rate_supported(sta, sband->band, i))
continue;
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
continue;
n++;
memset(ir, 0, sizeof(*ir));
ir->rix = i;
ir->last_attempts = 0;
ir->last_success = 0;
calc_service_time_values(ip,sband->band, ir, &sband->bitrates[i],
chandef);
initialize_map(ir,&sband->bitrates[i],chandef);
}
for (i = n; i < sband->n_bitrates; i++) {
struct indra_rate *ir = &ii->r[i];
ir->rix = -1;
}
/* Check if max retry is compliant with constraint on service time */
for (s = 1; s <= ip->max_retry; s++) {
struct indra_rate *ir = &ii->r[n-1];
st = st + ir->attempts[s-1];
if (st>ip->st_deadline) {
ip->max_retry = s - 1;
break;
}
}
ii->n_rates = n;
ii->last_snr = 0;
ii->flags = 0;
ii->tx_flags = 0;
indra_update_rates(ip, ii);
}