package/kernel/mac80211/patches/322-ath9k-Send-oneshot-NoA.patch

   1 From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
   2 Date: Fri, 17 Oct 2014 07:40:27 +0530
   3 Subject: [PATCH] ath9k: Send oneshot NoA
   4
   5 This patch makes sure that a GO interface
   6 sends out a new NoA schedule with 200ms duration
   7 when mgd_prepare_tx() is called.
   8
   9 Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
  10 ---
  11
  12 --- a/drivers/net/wireless/ath/ath9k/ath9k.h
  13 +++ b/drivers/net/wireless/ath/ath9k/ath9k.h
  14 @@ -620,6 +620,7 @@ struct ath_vif {
  15         u32 noa_start;
  16         u32 noa_duration;
  17         bool periodic_noa;
  18 +       bool oneshot_noa;
  19  };
  20
  21  struct ath9k_vif_iter_data {
  22 --- a/drivers/net/wireless/ath/ath9k/channel.c
  23 +++ b/drivers/net/wireless/ath/ath9k/channel.c
  24 @@ -450,6 +450,27 @@ static void ath_chanctx_set_periodic_noa
  25                 avp->periodic_noa);
  26  }
  27
  28 +static void ath_chanctx_set_oneshot_noa(struct ath_softc *sc,
  29 +                                       struct ath_vif *avp,
  30 +                                       u32 tsf_time,
  31 +                                       u32 duration)
  32 +{
  33 +       struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  34 +
  35 +       avp->noa_index++;
  36 +       avp->noa_start = tsf_time;
  37 +       avp->periodic_noa = false;
  38 +       avp->oneshot_noa = true;
  39 +       avp->noa_duration = duration + sc->sched.channel_switch_time;
  40 +
  41 +       ath_dbg(common, CHAN_CTX,
  42 +               "oneshot noa_duration: %d, noa_start: %d, noa_index: %d, periodic: %d\n",
  43 +               avp->noa_duration,
  44 +               avp->noa_start,
  45 +               avp->noa_index,
  46 +               avp->periodic_noa);
  47 +}
  48 +
  49  void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
  50                        enum ath_chanctx_event ev)
  51  {
  52 @@ -476,6 +497,14 @@ void ath_chanctx_event(struct ath_softc
  53                 if (avp->offchannel_duration)
  54                         avp->offchannel_duration = 0;
  55
  56 +               if (avp->oneshot_noa) {
  57 +                       avp->noa_duration = 0;
  58 +                       avp->oneshot_noa = false;
  59 +
  60 +                       ath_dbg(common, CHAN_CTX,
  61 +                               "Clearing oneshot NoA\n");
  62 +               }
  63 +
  64                 if (avp->chanctx != sc->cur_chan) {
  65                         ath_dbg(common, CHAN_CTX,
  66                                 "Contexts differ, not preparing beacon\n");
  67 @@ -551,6 +580,18 @@ void ath_chanctx_event(struct ath_softc
  68
  69                 ath_chanctx_handle_bmiss(sc, ctx, avp);
  70
  71 +               /*
  72 +                * If a mgd_prepare_tx() has been called by mac80211,
  73 +                * a one-shot NoA needs to be sent. This can happen
  74 +                * with one or more active channel contexts - in both
  75 +                * cases, a new NoA schedule has to be advertised.
  76 +                */
  77 +               if (sc->sched.mgd_prepare_tx) {
  78 +                       ath_chanctx_set_oneshot_noa(sc, avp, tsf_time,
  79 +                                                   jiffies_to_usecs(HZ / 5));
  80 +                       break;
  81 +               }
  82 +
  83                 /* Prevent wrap-around issues */
  84                 if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30))
  85                         avp->noa_duration = 0;