static void calc_service_time_values(void *priv, enum ieee80211_band band, struct indra_rate *r, struct ieee80211_rate *rate, struct cfg80211_chan_def *chandef) { struct indra_priv *ip = priv; unsigned int t_slot = 9; /* FIXME: get real slot time */ int erp = !!(rate->flags & IEEE80211_RATE_ERP_G); int shift = ieee80211_chandef_get_shift(chandef); int i; unsigned int pow[6] = {1,2,4,8,16,32}; r->perfect_tx_time = ieee80211_frame_duration(band, ip->ref_payload_size, DIV_ROUND_UP(rate->bitrate, 1 << shift), erp, 1, shift); r->ack_time = ieee80211_frame_duration(band, 10, /* this is not really correct....*/ DIV_ROUND_UP(rate->bitrate, 1 << shift), erp, 1, shift); for (i=0; i<7; i++) { if (i==0) { r->attempts[i] = 2*t_slot + r->perfect_tx_time + r->ack_time; } else { r->attempts[i] = 2*t_slot + r->perfect_tx_time + r->ack_time + t_slot*(pow[i-1]*(ip->cw_min+1)-1); } //printk("MICHELE: rate %i (d=%u, a=%u), attempt %i, time %u\n",r->rix,r->perfect_tx_time,r->ack_time,i,r->attempts[i]); } }
static void minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, struct cfg80211_chan_def *chandef, struct ieee80211_sta *sta, void *priv_sta) { struct minstrel_priv *mp = priv; struct minstrel_ht_sta_priv *msp = priv_sta; struct minstrel_ht_sta *mi = &msp->ht; struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; u16 ht_cap = sta->ht_cap.cap; struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; int use_vht; int n_supported = 0; int ack_dur; int stbc; int i; bool ldpc; /* fall back to the old minstrel for legacy stations */ if (!sta->ht_cap.ht_supported) goto use_legacy; BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); if (vht_cap->vht_supported) use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); else use_vht = 0; msp->is_ht = true; memset(mi, 0, sizeof(*mi)); mi->sta = sta; mi->last_stats_update = jiffies; ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); mi->overhead += ack_dur; mi->overhead_rtscts = mi->overhead + 2 * ack_dur; mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); /* When using MRR, sample more on the first attempt, without delay */ if (mp->has_mrr) { mi->sample_count = 16; mi->sample_wait = 0; } else { mi->sample_count = 8; mi->sample_wait = 8; } mi->sample_tries = 4; if (!use_vht) { stbc = (ht_cap & IEEE80211_HT_CAP_RX_STBC) >> IEEE80211_HT_CAP_RX_STBC_SHIFT; ldpc = ht_cap & IEEE80211_HT_CAP_LDPC_CODING; } else {
__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, struct ieee80211_vif *vif, size_t frame_len, const struct ieee80211_tx_info *frame_txctl) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_rate *rate; struct ieee80211_sub_if_data *sdata; bool short_preamble; int erp; u16 dur; struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; short_preamble = false; rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx]; erp = 0; if (vif) { sdata = vif_to_sdata(vif); short_preamble = sdata->vif.bss_conf.use_short_preamble; if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) erp = rate->flags & IEEE80211_RATE_ERP_G; } /* CTS duration */ dur = ieee80211_frame_duration(local, 10, rate->bitrate, erp, short_preamble); /* Data frame duration */ dur += ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, short_preamble); /* ACK duration */ dur += ieee80211_frame_duration(local, 10, rate->bitrate, erp, short_preamble); return cpu_to_le16(dur); }
/* Exported duration function for driver use */ __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, struct ieee80211_vif *vif, size_t frame_len, struct ieee80211_rate *rate) { struct ieee80211_local *local = hw_to_local(hw); struct ieee80211_sub_if_data *sdata; u16 dur; int erp; bool short_preamble = false; erp = 0; if (vif) { sdata = vif_to_sdata(vif); short_preamble = sdata->vif.bss_conf.use_short_preamble; if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) erp = rate->flags & IEEE80211_RATE_ERP_G; } dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp, short_preamble); return cpu_to_le16(dur); }
static void minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, struct cfg80211_chan_def *chandef, struct ieee80211_sta *sta, void *priv_sta) { struct minstrel_priv *mp = priv; struct minstrel_ht_sta_priv *msp = priv_sta; struct minstrel_ht_sta *mi = &msp->ht; struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; u16 sta_cap = sta->ht_cap.cap; int n_supported = 0; int ack_dur; int stbc; int i; /* fall back to the old minstrel for legacy stations */ if (!sta->ht_cap.ht_supported) goto use_legacy; BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS + 1); msp->is_ht = true; memset(mi, 0, sizeof(*mi)); mi->sta = sta; mi->stats_update = jiffies; ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); mi->overhead += ack_dur; mi->overhead_rtscts = mi->overhead + 2 * ack_dur; mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); /* When using MRR, sample more on the first attempt, without delay */ if (mp->has_mrr) { mi->sample_count = 16; mi->sample_wait = 0; } else { mi->sample_count = 8; mi->sample_wait = 8; } mi->sample_tries = 4; stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> IEEE80211_HT_CAP_RX_STBC_SHIFT; mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) mi->tx_flags |= IEEE80211_TX_CTL_LDPC; for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { mi->groups[i].supported = 0; if (i == MINSTREL_CCK_GROUP) { minstrel_ht_update_cck(mp, mi, sband, sta); continue; } if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) { if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) { if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) continue; } else { if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) continue; } } if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH && sta->bandwidth < IEEE80211_STA_RX_BW_40) continue; /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ if (sta->smps_mode == IEEE80211_SMPS_STATIC && minstrel_mcs_groups[i].streams > 1) continue; mi->groups[i].supported = mcs->rx_mask[minstrel_mcs_groups[i].streams - 1]; if (mi->groups[i].supported) n_supported++; } if (!n_supported) goto use_legacy; /* create an initial rate table with the lowest supported rates */ minstrel_ht_update_stats(mp, mi); minstrel_ht_update_rates(mp, mi); return; use_legacy: msp->is_ht = false; memset(&msp->legacy, 0, sizeof(msp->legacy)); msp->legacy.r = msp->ratelist; msp->legacy.sample_table = msp->sample_table; return mac80211_minstrel.rate_init(priv, sband, chandef, sta, &msp->legacy); }