package/mac80211/patches/540-ath9k_limit_qlen.patch

   1 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
   2 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
   3 @@ -238,6 +238,7 @@ struct ath_atx_tid {
   4         struct ath_node *an;
   5         struct ath_atx_ac *ac;
   6         unsigned long tx_buf[BITS_TO_LONGS(ATH_TID_MAX_BUFS)];
   7 +       int buf_pending;
   8         u16 seq_start;
   9         u16 seq_next;
  10         u16 baw_size;
  11 @@ -284,6 +285,9 @@ struct ath_tx_control {
  12   *  (axq_qnum).
  13   */
  14  struct ath_tx {
  15 +       u32 qlen_single;
  16 +       u32 qlen_aggr;
  17 +
  18         u16 seq_no;
  19         u32 txqsetup;
  20         spinlock_t txbuflock;
  21 --- a/drivers/net/wireless/ath/ath9k/debug.c
  22 +++ b/drivers/net/wireless/ath/ath9k/debug.c
  23 @@ -1729,6 +1729,10 @@ int ath9k_init_debug(struct ath_hw *ah)
  24                             sc, &fops_wiphy);
  25         debugfs_create_file("xmit", S_IRUSR, sc->debug.debugfs_phy, sc,
  26                             &fops_xmit);
  27 +       debugfs_create_u32("qlen_single", S_IRUSR | S_IWUSR,
  28 +                          sc->debug.debugfs_phy, &sc->tx.qlen_single);
  29 +       debugfs_create_u32("qlen_aggr", S_IRUSR | S_IWUSR,
  30 +                          sc->debug.debugfs_phy, &sc->tx.qlen_aggr);
  31         debugfs_create_file("stations", S_IRUSR, sc->debug.debugfs_phy, sc,
  32                             &fops_stations);
  33         debugfs_create_file("misc", S_IRUSR, sc->debug.debugfs_phy, sc,
  34 --- a/drivers/net/wireless/ath/ath9k/xmit.c
  35 +++ b/drivers/net/wireless/ath/ath9k/xmit.c
  36 @@ -355,6 +355,14 @@ static void ath_tx_count_frames(struct a
  37         }
  38  }
  39
  40 +static struct ath_atx_tid *ath_get_tid(struct ath_node *an, struct sk_buff *skb)
  41 +{
  42 +       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  43 +       u8 tidno;
  44 +
  45 +       tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
  46 +       return ATH_AN_2_TID(an, tidno);
  47 +}
  48
  49  static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
  50                                  struct ath_buf *bf, struct list_head *bf_q,
  51 @@ -443,6 +451,8 @@ static void ath_tx_complete_aggr(struct
  52         __skb_queue_head_init(&bf_pending);
  53
  54         ath_tx_count_frames(sc, bf, ts, txok, &nframes, &nbad);
  55 +       tid->buf_pending -= nframes;
  56 +
  57         while (bf) {
  58                 u16 seqno = bf->bf_state.seqno;
  59
  60 @@ -823,6 +833,7 @@ static enum ATH_AGGR_STATUS ath_tx_form_
  61                         ath_tx_addto_baw(sc, tid, seqno);
  62                 bf->bf_state.ndelim = ndelim;
  63
  64 +               tid->buf_pending++;
  65                 __skb_unlink(skb, &tid->buf_q);
  66                 list_add_tail(&bf->list, bf_q);
  67                 if (bf_prev)
  68 @@ -1682,6 +1693,8 @@ static void ath_tx_send_ampdu(struct ath
  69         /* Add sub-frame to BAW */
  70         ath_tx_addto_baw(sc, tid, bf->bf_state.seqno);
  71
  72 +       tid->buf_pending++;
  73 +
  74         /* Queue to h/w without aggregation */
  75         TX_STAT_INC(txctl->txq->axq_qnum, a_queued_hw);
  76         bf->bf_lastbf = bf;
  77 @@ -1810,23 +1823,13 @@ error:
  78
  79  /* FIXME: tx power */
  80  static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
  81 -                            struct ath_tx_control *txctl)
  82 +                            struct ath_tx_control *txctl,
  83 +                            struct ath_atx_tid *tid)
  84  {
  85         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
  86 -       struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  87 -       struct ath_atx_tid *tid = NULL;
  88         struct ath_buf *bf;
  89 -       u8 tidno;
  90
  91         spin_lock_bh(&txctl->txq->axq_lock);
  92 -       if ((sc->sc_flags & SC_OP_TXAGGR) && txctl->an &&
  93 -               ieee80211_is_data_qos(hdr->frame_control)) {
  94 -               tidno = ieee80211_get_qos_ctl(hdr)[0] &
  95 -                       IEEE80211_QOS_CTL_TID_MASK;
  96 -               tid = ATH_AN_2_TID(txctl->an, tidno);
  97 -
  98 -               WARN_ON(tid->ac->txq != txctl->txq);
  99 -       }
 100
 101         if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
 102                 /*
 103 @@ -1861,6 +1864,7 @@ int ath_tx_start(struct ieee80211_hw *hw
 104         struct ieee80211_vif *vif = info->control.vif;
 105         struct ath_softc *sc = hw->priv;
 106         struct ath_txq *txq = txctl->txq;
 107 +       struct ath_atx_tid *tid = NULL;
 108         int padpos, padsize;
 109         int frmlen = skb->len + FCS_LEN;
 110         int q;
 111 @@ -1903,6 +1907,24 @@ int ath_tx_start(struct ieee80211_hw *hw
 112
 113         setup_frame_info(hw, skb, frmlen);
 114
 115 +       if ((sc->sc_flags & SC_OP_TXAGGR) && txctl->an &&
 116 +           ieee80211_is_data_qos(hdr->frame_control)) {
 117 +               tid = ath_get_tid(txctl->an, skb);
 118 +
 119 +               WARN_ON(tid->ac->txq != txq);
 120 +       }
 121 +
 122 +       if ((info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
 123 +               if (sc->tx.qlen_aggr > 0 && skb_queue_len(&tid->buf_q) +
 124 +                   tid->buf_pending >= sc->tx.qlen_aggr)
 125 +                       return -ENOMEM;
 126 +       } else {
 127 +               if (sc->tx.qlen_single > 0 &&
 128 +                   txq->axq_depth - txq->axq_ampdu_depth >=
 129 +                     sc->tx.qlen_single)
 130 +                       return -ENOMEM;
 131 +       }
 132 +
 133         /*
 134          * At this point, the vif, hw_key and sta pointers in the tx control
 135          * info are no longer valid (overwritten by the ath_frame_info data.
 136 @@ -1917,7 +1939,7 @@ int ath_tx_start(struct ieee80211_hw *hw
 137         }
 138         spin_unlock_bh(&txq->axq_lock);
 139
 140 -       ath_tx_start_dma(sc, skb, txctl);
 141 +       ath_tx_start_dma(sc, skb, txctl, tid);
 142         return 0;
 143  }
 144