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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Tue, 29 Jun 2021 13:25:09 +0200
   3 Subject: [PATCH] mac80211: fix starting aggregation sessions on mesh
   4  interfaces
   5
   6 The logic for starting aggregation sessions was recently moved from minstrel_ht
   7 to mac80211, into the subif tx handler just after the sta lookup.
   8 Unfortunately this didn't work for mesh interfaces, since the sta lookup is
   9 deferred until a much later point in time on those.
  10 Fix this by also calling the aggregation check right after the deferred sta
  11 lookup.
  12
  13 Fixes: 08a46c642001 ("mac80211: move A-MPDU session check from minstrel_ht to mac80211")
  14 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  15 ---
  16
  17 --- a/net/mac80211/tx.c
  18 +++ b/net/mac80211/tx.c
  19 @@ -1159,6 +1159,29 @@ static bool ieee80211_tx_prep_agg(struct
  20         return queued;
  21  }
  22
  23 +static void
  24 +ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
  25 +                    struct sta_info *sta,
  26 +                    struct sk_buff *skb)
  27 +{
  28 +       struct rate_control_ref *ref = sdata->local->rate_ctrl;
  29 +       u16 tid;
  30 +
  31 +       if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
  32 +               return;
  33 +
  34 +       if (!sta || !sta->sta.ht_cap.ht_supported ||
  35 +           !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
  36 +           skb->protocol == sdata->control_port_protocol)
  37 +               return;
  38 +
  39 +       tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
  40 +       if (likely(sta->ampdu_mlme.tid_tx[tid]))
  41 +               return;
  42 +
  43 +       ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
  44 +}
  45 +
  46  /*
  47   * initialises @tx
  48   * pass %NULL for the station if unknown, a valid pointer if known
  49 @@ -1172,6 +1195,7 @@ ieee80211_tx_prepare(struct ieee80211_su
  50         struct ieee80211_local *local = sdata->local;
  51         struct ieee80211_hdr *hdr;
  52         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  53 +       bool aggr_check = false;
  54         int tid;
  55
  56         memset(tx, 0, sizeof(*tx));
  57 @@ -1200,8 +1224,10 @@ ieee80211_tx_prepare(struct ieee80211_su
  58                 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
  59                         tx->sta = sta_info_get_bss(sdata, hdr->addr1);
  60                 }
  61 -               if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
  62 +               if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
  63                         tx->sta = sta_info_get(sdata, hdr->addr1);
  64 +                       aggr_check = true;
  65 +               }
  66         }
  67
  68         if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
  69 @@ -1211,8 +1237,12 @@ ieee80211_tx_prepare(struct ieee80211_su
  70                 struct tid_ampdu_tx *tid_tx;
  71
  72                 tid = ieee80211_get_tid(hdr);
  73 -
  74                 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
  75 +               if (!tid_tx && aggr_check) {
  76 +                       ieee80211_aggr_check(sdata, tx->sta, skb);
  77 +                       tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
  78 +               }
  79 +
  80                 if (tid_tx) {
  81                         bool queued;
  82
  83 @@ -3947,29 +3977,6 @@ void ieee80211_txq_schedule_start(struct
  84  }
  85  EXPORT_SYMBOL(ieee80211_txq_schedule_start);
  86
  87 -static void
  88 -ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
  89 -                    struct sta_info *sta,
  90 -                    struct sk_buff *skb)
  91 -{
  92 -       struct rate_control_ref *ref = sdata->local->rate_ctrl;
  93 -       u16 tid;
  94 -
  95 -       if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
  96 -               return;
  97 -
  98 -       if (!sta || !sta->sta.ht_cap.ht_supported ||
  99 -           !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
 100 -           skb->protocol == sdata->control_port_protocol)
 101 -               return;
 102 -
 103 -       tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
 104 -       if (likely(sta->ampdu_mlme.tid_tx[tid]))
 105 -               return;
 106 -
 107 -       ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
 108 -}
 109 -
 110  void __ieee80211_subif_start_xmit(struct sk_buff *skb,
 111                                   struct net_device *dev,
 112                                   u32 info_flags,