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- From: Felix Fietkau <[email protected]>
- Date: Wed, 6 Aug 2025 10:52:03 +0200
- Subject: [PATCH] mac80211: estimate expected throughput if not provided by
- driver/rc
- Estimate the tx throughput based on the expected per-packet tx time.
- This is useful for mesh implementations that rely on expected throughput,
- e.g. 802.11s or batman-adv.
- Signed-off-by: Felix Fietkau <[email protected]>
- ---
- --- a/net/mac80211/sta_info.c
- +++ b/net/mac80211/sta_info.c
- @@ -2977,6 +2977,29 @@ static void sta_set_link_sinfo(struct st
- }
- }
-
- +static u32 sta_estimate_expected_throughput(struct sta_info *sta,
- + struct station_info *sinfo)
- +{
- + struct ieee80211_sub_if_data *sdata = sta->sdata;
- + struct ieee80211_local *local = sdata->local;
- + struct rate_info *ri = &sinfo->txrate;
- + struct ieee80211_hw *hw = &local->hw;
- + struct ieee80211_chanctx_conf *conf;
- + u32 duration;
- + u8 band = 0;
- +
- + conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
- + if (conf)
- + band = conf->def.chan->band;
- +
- + duration = ieee80211_rate_expected_tx_airtime(hw, NULL, ri, band, true, 1024);
- + duration += duration >> 4; /* add assumed packet error rate of ~6% */
- + if (!duration)
- + return 0;
- +
- + return ((1024 * USEC_PER_SEC) / duration) * 8;
- +}
- +
- void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
- bool tidstats)
- {
- @@ -3201,6 +3224,8 @@ void sta_set_sinfo(struct sta_info *sta,
- sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
-
- thr = sta_get_expected_throughput(sta);
- + if (!thr && (sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE)))
- + thr = sta_estimate_expected_throughput(sta, sinfo);
-
- if (thr != 0) {
- sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
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