package/mac80211/patches/300-minstrel_no_mrr.patch

   1 This fixes tx status processing for drivers that do not support mrr.
   2 If the retry count is bigger than the maximum retry count configured in
   3 the hardware, do not count the rate attempt as successful, the hardware
   4 has probably switched to a lower rate.
   5
   6 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
   7
   8 --- a/net/mac80211/rc80211_minstrel.c
   9 +++ b/net/mac80211/rc80211_minstrel.c
  10 @@ -171,6 +171,7 @@ minstrel_tx_status(void *priv, struct ie
  11         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  12         struct ieee80211_tx_altrate *ar = info->status.retries;
  13         struct minstrel_priv *mp = priv;
  14 +       struct ieee80211_local *local = hw_to_local(mp->hw);
  15         int i, ndx, tries;
  16         int success = 0;
  17
  18 @@ -180,6 +181,13 @@ minstrel_tx_status(void *priv, struct ie
  19         if (!mp->has_mrr || (ar[0].rate_idx < 0)) {
  20                 ndx = rix_to_ndx(mi, info->tx_rate_idx);
  21                 tries = info->status.retry_count + 1;
  22 +
  23 +               /* If the driver does not support the MRR API, but uses
  24 +                * a fallback rate, use the long retry limit as indication
  25 +                * that a rate switch has happened */
  26 +               if (!mp->has_mrr && (tries >= local->long_retry_limit))
  27 +                       success = 0;
  28 +
  29                 mi->r[ndx].success += success;
  30                 mi->r[ndx].attempts += tries;
  31                 return;