forked from Minki/linux
mac80211/minstrel: use the new rate control API
Pass the rate selection table to mac80211 from minstrel_update_stats. Only rates for sample attempts are set in info->control.rates, with deferred sampling, only the second slot gets changed. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
Johannes Berg
parent
a85666627b
commit
06d961a8e2
@ -83,6 +83,50 @@ minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list)
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tp_list[j] = i;
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}
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static void
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minstrel_set_rate(struct minstrel_sta_info *mi, struct ieee80211_sta_rates *ratetbl,
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int offset, int idx)
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{
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struct minstrel_rate *r = &mi->r[idx];
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ratetbl->rate[offset].idx = r->rix;
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ratetbl->rate[offset].count = r->adjusted_retry_count;
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ratetbl->rate[offset].count_cts = r->retry_count_cts;
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ratetbl->rate[offset].count_rts = r->retry_count_rtscts;
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}
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static void
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minstrel_update_rates(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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{
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struct ieee80211_sta_rates *ratetbl;
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int i = 0;
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ratetbl = kzalloc(sizeof(*ratetbl), GFP_ATOMIC);
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if (!ratetbl)
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return;
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/* Start with max_tp_rate */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[0]);
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if (mp->hw->max_rates >= 3) {
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/* At least 3 tx rates supported, use max_tp_rate2 next */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[1]);
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}
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if (mp->hw->max_rates >= 2) {
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/* At least 2 tx rates supported, use max_prob_rate next */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_prob_rate);
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}
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/* Use lowest rate last */
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ratetbl->rate[i].idx = mi->lowest_rix;
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ratetbl->rate[i].count = mp->max_retry;
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ratetbl->rate[i].count_cts = mp->max_retry;
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ratetbl->rate[i].count_rts = mp->max_retry;
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rate_control_set_rates(mp->hw, mi->sta, ratetbl);
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}
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static void
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minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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{
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@ -161,6 +205,8 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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/* Reset update timer */
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mi->stats_update = jiffies;
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minstrel_update_rates(mp, mi);
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}
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static void
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@ -240,13 +286,12 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct minstrel_sta_info *mi = priv_sta;
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struct minstrel_priv *mp = priv;
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struct ieee80211_tx_rate *ar = info->control.rates;
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unsigned int ndx, sample_ndx = 0;
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struct ieee80211_tx_rate *rate = &info->control.rates[0];
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struct minstrel_rate *msr, *mr;
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unsigned int ndx;
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bool mrr_capable;
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bool indirect_rate_sampling = false;
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bool rate_sampling = false;
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int i, delta;
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int mrr_ndx[3];
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bool prev_sample = mi->prev_sample;
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int delta;
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int sampling_ratio;
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/* management/no-ack frames do not use rate control */
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@ -262,107 +307,75 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
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else
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sampling_ratio = mp->lookaround_rate;
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/* init rateindex [ndx] with max throughput rate */
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ndx = mi->max_tp_rate[0];
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/* increase sum packet counter */
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mi->packet_count++;
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delta = (mi->packet_count * sampling_ratio / 100) -
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(mi->sample_count + mi->sample_deferred / 2);
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/* delta > 0: sampling required */
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if ((delta > 0) && (mrr_capable || !mi->prev_sample)) {
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struct minstrel_rate *msr;
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if (mi->packet_count >= 10000) {
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mi->sample_deferred = 0;
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mi->sample_count = 0;
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mi->packet_count = 0;
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} else if (delta > mi->n_rates * 2) {
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/* With multi-rate retry, not every planned sample
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* attempt actually gets used, due to the way the retry
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* chain is set up - [max_tp,sample,prob,lowest] for
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* sample_rate < max_tp.
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*
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* If there's too much sampling backlog and the link
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* starts getting worse, minstrel would start bursting
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* out lots of sampling frames, which would result
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* in a large throughput loss. */
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mi->sample_count += (delta - mi->n_rates * 2);
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}
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/* delta < 0: no sampling required */
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mi->prev_sample = false;
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if (delta < 0 || (!mrr_capable && prev_sample))
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return;
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/* get next random rate sample */
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sample_ndx = minstrel_get_next_sample(mi);
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msr = &mi->r[sample_ndx];
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rate_sampling = true;
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/* Decide if direct ( 1st mrr stage) or indirect (2nd mrr stage)
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* rate sampling method should be used.
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* Respect such rates that are not sampled for 20 interations.
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*/
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if (mrr_capable &&
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msr->perfect_tx_time > mi->r[ndx].perfect_tx_time &&
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msr->sample_skipped < 20)
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indirect_rate_sampling = true;
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if (!indirect_rate_sampling) {
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if (msr->sample_limit != 0) {
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ndx = sample_ndx;
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mi->sample_count++;
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if (msr->sample_limit > 0)
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msr->sample_limit--;
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} else
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rate_sampling = false;
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} else {
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/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
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* packets that have the sampling rate deferred to the
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* second MRR stage. Increase the sample counter only
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* if the deferred sample rate was actually used.
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* Use the sample_deferred counter to make sure that
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* the sampling is not done in large bursts */
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info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
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mi->sample_deferred++;
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}
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if (mi->packet_count >= 10000) {
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mi->sample_deferred = 0;
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mi->sample_count = 0;
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mi->packet_count = 0;
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} else if (delta > mi->n_rates * 2) {
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/* With multi-rate retry, not every planned sample
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* attempt actually gets used, due to the way the retry
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* chain is set up - [max_tp,sample,prob,lowest] for
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* sample_rate < max_tp.
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*
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* If there's too much sampling backlog and the link
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* starts getting worse, minstrel would start bursting
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* out lots of sampling frames, which would result
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* in a large throughput loss. */
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mi->sample_count += (delta - mi->n_rates * 2);
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}
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/* get next random rate sample */
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ndx = minstrel_get_next_sample(mi);
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msr = &mi->r[ndx];
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mr = &mi->r[mi->max_tp_rate[0]];
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/* Decide if direct ( 1st mrr stage) or indirect (2nd mrr stage)
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* rate sampling method should be used.
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* Respect such rates that are not sampled for 20 interations.
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*/
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if (mrr_capable &&
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msr->perfect_tx_time > mr->perfect_tx_time &&
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msr->sample_skipped < 20) {
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/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
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* packets that have the sampling rate deferred to the
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* second MRR stage. Increase the sample counter only
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* if the deferred sample rate was actually used.
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* Use the sample_deferred counter to make sure that
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* the sampling is not done in large bursts */
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info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
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rate++;
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mi->sample_deferred++;
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} else {
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if (!msr->sample_limit != 0)
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return;
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mi->sample_count++;
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if (msr->sample_limit > 0)
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msr->sample_limit--;
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}
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mi->prev_sample = rate_sampling;
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/* If we're not using MRR and the sampling rate already
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* has a probability of >95%, we shouldn't be attempting
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* to use it, as this only wastes precious airtime */
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if (!mrr_capable && rate_sampling &&
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if (!mrr_capable &&
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(mi->r[ndx].probability > MINSTREL_FRAC(95, 100)))
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ndx = mi->max_tp_rate[0];
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/* mrr setup for 1st stage */
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ar[0].idx = mi->r[ndx].rix;
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ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info);
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/* non mrr setup for 2nd stage */
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if (!mrr_capable) {
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if (!rate_sampling)
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ar[0].count = mp->max_retry;
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ar[1].idx = mi->lowest_rix;
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ar[1].count = mp->max_retry;
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return;
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}
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/* mrr setup for 2nd stage */
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if (rate_sampling) {
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if (indirect_rate_sampling)
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mrr_ndx[0] = sample_ndx;
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else
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mrr_ndx[0] = mi->max_tp_rate[0];
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} else {
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mrr_ndx[0] = mi->max_tp_rate[1];
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}
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mi->prev_sample = true;
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/* mrr setup for 3rd & 4th stage */
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mrr_ndx[1] = mi->max_prob_rate;
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mrr_ndx[2] = 0;
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for (i = 1; i < 4; i++) {
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ar[i].idx = mi->r[mrr_ndx[i - 1]].rix;
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ar[i].count = mi->r[mrr_ndx[i - 1]].adjusted_retry_count;
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}
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rate->idx = mi->r[ndx].rix;
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rate->count = minstrel_get_retry_count(&mi->r[ndx], info);
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}
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@ -412,12 +425,16 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
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unsigned int i, n = 0;
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unsigned int t_slot = 9; /* FIXME: get real slot time */
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mi->sta = sta;
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mi->lowest_rix = rate_lowest_index(sband, sta);
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ctl_rate = &sband->bitrates[mi->lowest_rix];
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mi->sp_ack_dur = ieee80211_frame_duration(sband->band, 10,
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ctl_rate->bitrate,
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!!(ctl_rate->flags & IEEE80211_RATE_ERP_G), 1);
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memset(mi->max_tp_rate, 0, sizeof(mi->max_tp_rate));
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mi->max_prob_rate = 0;
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for (i = 0; i < sband->n_bitrates; i++) {
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struct minstrel_rate *mr = &mi->r[n];
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unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0;
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@ -473,6 +490,7 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
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mi->stats_update = jiffies;
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init_sample_table(mi);
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minstrel_update_rates(mp, mi);
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}
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static void *
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@ -63,6 +63,8 @@ struct minstrel_rate {
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};
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struct minstrel_sta_info {
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struct ieee80211_sta *sta;
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unsigned long stats_update;
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unsigned int sp_ack_dur;
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unsigned int rate_avg;
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