package/kernel/mac80211/patches/subsys/346-v6.0-wifi-mac80211-fix-mesh-airtime-link-metric-estimatin.patch

   1 From: Aditya Kumar Singh <quic_adisi@quicinc.com>
   2 Date: Fri, 1 Jul 2022 19:06:11 +0530
   3 Subject: [PATCH] wifi: mac80211: fix mesh airtime link metric estimating
   4
   5 ieee80211s_update_metric function uses sta_set_rate_info_tx
   6 function to get struct rate_info data from ieee80211_tx_rate
   7 struct, present in ieee80211_sta->deflink.tx_stats. However,
   8 drivers can skip tx rate calculation by setting rate idx as
   9 -1. Such drivers provides rate_info directly and hence
  10 ieee80211s metric is updated incorrectly since ieee80211_tx_rate
  11 has inconsistent data.
  12
  13 Add fix to use rate_info directly if present instead of
  14 sta_set_rate_info_tx for updating ieee80211s metric.
  15
  16 Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
  17 Link: https://lore.kernel.org/r/20220701133611.544-1-quic_adisi@quicinc.com
  18 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  19 ---
  20
  21 --- a/net/mac80211/mesh_hwmp.c
  22 +++ b/net/mac80211/mesh_hwmp.c
  23 @@ -310,7 +310,12 @@ void ieee80211s_update_metric(struct iee
  24                         LINK_FAIL_THRESH)
  25                 mesh_plink_broken(sta);
  26
  27 -       sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
  28 +       /* use rate info set by the driver directly if present */
  29 +       if (st->rate)
  30 +               rinfo = sta->tx_stats.last_rate_info;
  31 +       else
  32 +               sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
  33 +
  34         ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg,
  35                                   cfg80211_calculate_bitrate(&rinfo));
  36  }