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   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Sat, 23 Oct 2021 11:10:51 +0200
   3 Subject: [PATCH] mac80211: introduce set_radar_offchan callback
   4
   5 Similar to cfg80211, introduce set_radar_offchan callback in mac80211_ops
   6 in order to configure a dedicated offchannel chain available on some hw
   7 (e.g. mt7915) to perform offchannel CAC detection and avoid tx/rx downtime.
   8
   9 Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
  10 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  11 Link: https://lore.kernel.org/r/201110606d4f3a7dfdf31440e351f2e2c375d4f0.1634979655.git.lorenzo@kernel.org
  12 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  13 ---
  14
  15 --- a/include/net/mac80211.h
  16 +++ b/include/net/mac80211.h
  17 @@ -3937,6 +3937,14 @@ struct ieee80211_prep_tx_info {
  18   *     twt structure.
  19   * @twt_teardown_request: Update the hw with TWT teardown request received
  20   *     from the peer.
  21 + * @set_radar_offchan: Configure dedicated offchannel chain available for
  22 + *     radar/CAC detection on some hw. This chain can't be used to transmit
  23 + *     or receive frames and it is bounded to a running wdev.
  24 + *     Offchannel radar/CAC detection allows to avoid the CAC downtime
  25 + *     switching to a different channel during CAC detection on the selected
  26 + *     radar channel.
  27 + *     The caller is expected to set chandef pointer to NULL in order to
  28 + *     disable offchannel CAC/radar detection.
  29   * @net_fill_forward_path: Called from .ndo_fill_forward_path in order to
  30   *     resolve a path for hardware flow offloading
  31   */
  32 @@ -4267,6 +4275,8 @@ struct ieee80211_ops {
  33                               struct ieee80211_twt_setup *twt);
  34         void (*twt_teardown_request)(struct ieee80211_hw *hw,
  35                                      struct ieee80211_sta *sta, u8 flowid);
  36 +       int (*set_radar_offchan)(struct ieee80211_hw *hw,
  37 +                                struct cfg80211_chan_def *chandef);
  38  #if LINUX_VERSION_IS_GEQ(5,10,0)
  39         int (*net_fill_forward_path)(struct ieee80211_hw *hw,
  40                                      struct ieee80211_vif *vif,
  41 --- a/net/mac80211/cfg.c
  42 +++ b/net/mac80211/cfg.c
  43 @@ -4344,6 +4344,18 @@ out:
  44         return err;
  45  }
  46
  47 +static int
  48 +ieee80211_set_radar_offchan(struct wiphy *wiphy,
  49 +                           struct cfg80211_chan_def *chandef)
  50 +{
  51 +       struct ieee80211_local *local = wiphy_priv(wiphy);
  52 +
  53 +       if (!local->ops->set_radar_offchan)
  54 +               return -EOPNOTSUPP;
  55 +
  56 +       return local->ops->set_radar_offchan(&local->hw, chandef);
  57 +}
  58 +
  59  const struct cfg80211_ops mac80211_config_ops = {
  60         .add_virtual_intf = ieee80211_add_iface,
  61         .del_virtual_intf = ieee80211_del_iface,
  62 @@ -4448,4 +4460,5 @@ const struct cfg80211_ops mac80211_confi
  63         .reset_tid_config = ieee80211_reset_tid_config,
  64         .set_sar_specs = ieee80211_set_sar_specs,
  65         .color_change = ieee80211_color_change,
  66 +       .set_radar_offchan = ieee80211_set_radar_offchan,
  67  };