/* Transmit duration for the raw data part of an average sized packet */
#define MCS_DURATION(streams, sgi, bps) MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps)))
+/*
+ * Define group sort order: HT40 -> SGI -> #streams
+ */
+#define GROUP_IDX(_streams, _sgi, _ht40) \
+ MINSTREL_MAX_STREAMS * 2 * _ht40 + \
+ MINSTREL_MAX_STREAMS * _sgi + \
+ _streams - 1
+
/* MCS rate information for an MCS group */
-#define MCS_GROUP(_streams, _sgi, _ht40) { \
+#define MCS_GROUP(_streams, _sgi, _ht40) \
+ [GROUP_IDX(_streams, _sgi, _ht40)] = { \
.streams = _streams, \
.flags = \
(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
* To enable sufficiently targeted rate sampling, MCS rates are divided into
* groups, based on the number of streams and flags (HT40, SGI) that they
* use.
+ *
+ * Sortorder has to be fixed for GROUP_IDX macro to be applicable:
+ * HT40 -> SGI -> #streams
*/
const struct mcs_group minstrel_mcs_groups[] = {
MCS_GROUP(1, 0, 0),
static int
minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate)
{
- int streams = (rate->idx / MCS_GROUP_RATES) + 1;
- u32 flags = IEEE80211_TX_RC_SHORT_GI | IEEE80211_TX_RC_40_MHZ_WIDTH;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) {
- if (minstrel_mcs_groups[i].streams != streams)
- continue;
- if (minstrel_mcs_groups[i].flags != (rate->flags & flags))
- continue;
-
- return i;
- }
-
- WARN_ON(1);
- return 0;
+ return GROUP_IDX((rate->idx / MCS_GROUP_RATES) + 1,
+ !!(rate->flags & IEEE80211_TX_RC_SHORT_GI),
+ !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH));
}
static inline struct minstrel_rate_stats *
* Recalculate success probabilities and counters for a rate using EWMA
*/
static void
-minstrel_calc_rate_ewma(struct minstrel_priv *mp, struct minstrel_rate_stats *mr)
+minstrel_calc_rate_ewma(struct minstrel_rate_stats *mr)
{
if (unlikely(mr->attempts > 0)) {
mr->sample_skipped = 0;
* the expected number of retransmissions and their expected length
*/
static void
-minstrel_ht_calc_tp(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
- int group, int rate)
+minstrel_ht_calc_tp(struct minstrel_ht_sta *mi, int group, int rate)
{
struct minstrel_rate_stats *mr;
unsigned int usecs;
mr = &mg->rates[i];
mr->retry_updated = false;
index = MCS_GROUP_RATES * group + i;
- minstrel_calc_rate_ewma(mp, mr);
- minstrel_ht_calc_tp(mp, mi, group, i);
+ minstrel_calc_rate_ewma(mr);
+ minstrel_ht_calc_tp(mi, group, i);
if (!mr->cur_tp)
continue;
static bool
minstrel_ht_txstat_valid(struct ieee80211_tx_rate *rate)
{
- if (!rate->count)
+ if (rate->idx < 0)
return false;
- if (rate->idx < 0)
+ if (!rate->count)
return false;
return !!(rate->flags & IEEE80211_TX_RC_MCS);
}
static void
-minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb)
+minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) {
minstrel_ht_update_stats(mp, mi);
if (!(info->flags & IEEE80211_TX_CTL_AMPDU))
- minstrel_aggr_check(mp, sta, skb);
+ minstrel_aggr_check(sta, skb);
}
}
static void
minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
struct ieee80211_tx_rate *rate, int index,
- struct ieee80211_tx_rate_control *txrc,
bool sample, bool rtscts)
{
const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
sample_idx += mi->sample_group * MCS_GROUP_RATES;
minstrel_next_sample_idx(mi);
+ /*
+ * Sampling might add some overhead (RTS, no aggregation)
+ * to the frame. Hence, don't use sampling for the currently
+ * used max TP rate.
+ */
+ if (sample_idx == mi->max_tp_rate)
+ return -1;
/*
* When not using MRR, do not sample if the probability is already
* higher than 95% to avoid wasting airtime
if (sample_idx >= 0) {
sample = true;
minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
- txrc, true, false);
+ true, false);
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
} else {
minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
- txrc, false, false);
+ false, false);
}
if (mp->hw->max_rates >= 3) {
*/
if (sample_idx >= 0)
minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
- txrc, false, false);
+ false, false);
else
minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2,
- txrc, false, true);
+ false, true);
minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate,
- txrc, false, !sample);
+ false, !sample);
ar[3].count = 0;
ar[3].idx = -1;
* max_tp_rate -> max_prob_rate by default.
*/
minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_prob_rate,
- txrc, false, !sample);
+ false, !sample);
ar[2].count = 0;
ar[2].idx = -1;
int ack_dur;
int stbc;
int i;
+ unsigned int smps;
/* fall back to the old minstrel for legacy stations */
if (!sta->ht_cap.ht_supported)
oper_chan_type != NL80211_CHAN_HT40PLUS)
sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+ smps = (sta_cap & IEEE80211_HT_CAP_SM_PS) >>
+ IEEE80211_HT_CAP_SM_PS_SHIFT;
+
for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
u16 req = 0;
if ((sta_cap & req) != req)
continue;
+ /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */
+ if (smps == WLAN_HT_CAP_SM_PS_STATIC &&
+ minstrel_mcs_groups[i].streams > 1)
+ continue;
+
mi->groups[i].supported =
mcs->rx_mask[minstrel_mcs_groups[i].streams - 1];
git.openpandora.org / pandora-kernel.git / blobdiff