package/kernel/mac80211/patches/subsys/500-mac80211_configure_antenna_gain.patch

   1 --- a/include/net/cfg80211.h
   2 +++ b/include/net/cfg80211.h
   3 @@ -3869,6 +3869,7 @@ struct mgmt_frame_regs {
   4   *     (as advertised by the nl80211 feature flag.)
   5   * @get_tx_power: store the current TX power into the dbm variable;
   6   *     return 0 if successful
   7 + * @set_antenna_gain: set antenna gain to reduce maximum tx power if necessary
   8   *
   9   * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
  10   *     functions to adjust rfkill hw state
  11 @@ -4202,6 +4203,7 @@ struct cfg80211_ops {
  12                                 enum nl80211_tx_power_setting type, int mbm);
  13         int     (*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
  14                                 int *dbm);
  15 +       int     (*set_antenna_gain)(struct wiphy *wiphy, int dbi);
  16
  17         void    (*rfkill_poll)(struct wiphy *wiphy);
  18
  19 --- a/include/net/mac80211.h
  20 +++ b/include/net/mac80211.h
  21 @@ -1566,6 +1566,7 @@ enum ieee80211_smps_mode {
  22   *
  23   * @power_level: requested transmit power (in dBm), backward compatibility
  24   *     value only that is set to the minimum of all interfaces
  25 + * @max_antenna_gain: maximum antenna gain adjusted by user config (in dBi)
  26   *
  27   * @chandef: the channel definition to tune to
  28   * @radar_enabled: whether radar detection is enabled
  29 @@ -1586,6 +1587,7 @@ enum ieee80211_smps_mode {
  30  struct ieee80211_conf {
  31         u32 flags;
  32         int power_level, dynamic_ps_timeout;
  33 +       int max_antenna_gain;
  34
  35         u16 listen_interval;
  36         u8 ps_dtim_period;
  37 --- a/include/uapi/linux/nl80211.h
  38 +++ b/include/uapi/linux/nl80211.h
  39 @@ -2615,6 +2615,9 @@ enum nl80211_commands {
  40   *     switching on a different channel during CAC detection on the selected
  41   *     radar channel.
  42   *
  43 + * @NL80211_ATTR_WIPHY_ANTENNA_GAIN: Configured antenna gain. Used to reduce
  44 + *     transmit power to stay within regulatory limits. u32, dBi.
  45 + *
  46   * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  47   * @NL80211_ATTR_MAX: highest attribute number currently defined
  48   * @__NL80211_ATTR_AFTER_LAST: internal use
  49 @@ -3123,6 +3126,8 @@ enum nl80211_attrs {
  50
  51         NL80211_ATTR_RADAR_BACKGROUND,
  52
  53 +       NL80211_ATTR_WIPHY_ANTENNA_GAIN,
  54 +
  55         /* add attributes here, update the policy in nl80211.c */
  56
  57         __NL80211_ATTR_AFTER_LAST,
  58 --- a/net/mac80211/cfg.c
  59 +++ b/net/mac80211/cfg.c
  60 @@ -2812,6 +2812,19 @@ static int ieee80211_get_tx_power(struct
  61         return 0;
  62  }
  63
  64 +static int ieee80211_set_antenna_gain(struct wiphy *wiphy, int dbi)
  65 +{
  66 +       struct ieee80211_local *local = wiphy_priv(wiphy);
  67 +
  68 +       if (dbi < 0)
  69 +               return -EINVAL;
  70 +
  71 +       local->user_antenna_gain = dbi;
  72 +       ieee80211_hw_config(local, 0);
  73 +
  74 +       return 0;
  75 +}
  76 +
  77  static void ieee80211_rfkill_poll(struct wiphy *wiphy)
  78  {
  79         struct ieee80211_local *local = wiphy_priv(wiphy);
  80 @@ -4516,6 +4529,7 @@ const struct cfg80211_ops mac80211_confi
  81         .set_wiphy_params = ieee80211_set_wiphy_params,
  82         .set_tx_power = ieee80211_set_tx_power,
  83         .get_tx_power = ieee80211_get_tx_power,
  84 +       .set_antenna_gain = ieee80211_set_antenna_gain,
  85         .rfkill_poll = ieee80211_rfkill_poll,
  86         CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
  87         CFG80211_TESTMODE_DUMP(ieee80211_testmode_dump)
  88 --- a/net/mac80211/ieee80211_i.h
  89 +++ b/net/mac80211/ieee80211_i.h
  90 @@ -1448,6 +1448,7 @@ struct ieee80211_local {
  91         int dynamic_ps_forced_timeout;
  92
  93         int user_power_level; /* in dBm, for all interfaces */
  94 +       int user_antenna_gain; /* in dBi */
  95
  96         enum ieee80211_smps_mode smps_mode;
  97
  98 --- a/net/mac80211/main.c
  99 +++ b/net/mac80211/main.c
 100 @@ -96,7 +96,7 @@ static u32 ieee80211_hw_conf_chan(struct
 101         struct ieee80211_sub_if_data *sdata;
 102         struct cfg80211_chan_def chandef = {};
 103         u32 changed = 0;
 104 -       int power;
 105 +       int power, max_power;
 106         u32 offchannel_flag;
 107
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109 @@ -157,6 +157,12 @@ static u32 ieee80211_hw_conf_chan(struct
 110         }
 111         rcu_read_unlock();
 112
 113 +       max_power = chandef.chan->max_reg_power;
 114 +       if (local->user_antenna_gain > 0) {
 115 +               max_power -= local->user_antenna_gain;
 116 +               power = min(power, max_power);
 117 +       }
 118 +
 119         if (local->hw.conf.power_level != power) {
 120                 changed |= IEEE80211_CONF_CHANGE_POWER;
 121                 local->hw.conf.power_level = power;
 122 @@ -679,6 +685,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_
 123                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 124         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 125                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 126 +       local->user_antenna_gain = 0;
 127         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 128         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 129         local->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
 130 --- a/net/wireless/nl80211.c
 131 +++ b/net/wireless/nl80211.c
 132 @@ -802,6 +802,7 @@ static const struct nla_policy nl80211_p
 133                         NLA_POLICY_NESTED(nl80211_mbssid_config_policy),
 134         [NL80211_ATTR_MBSSID_ELEMS] = { .type = NLA_NESTED },
 135         [NL80211_ATTR_RADAR_BACKGROUND] = { .type = NLA_FLAG },
 136 +       [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 },
 137  };
 138
 139  /* policy for the key attributes */
 140 @@ -3391,6 +3392,22 @@ static int nl80211_set_wiphy(struct sk_b
 141                 if (result)
 142                         goto out;
 143         }
 144 +
 145 +       if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) {
 146 +               int idx, dbi = 0;
 147 +
 148 +               if (!rdev->ops->set_antenna_gain) {
 149 +                       result = -EOPNOTSUPP;
 150 +                       goto out;
 151 +               }
 152 +
 153 +               idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN;
 154 +               dbi = nla_get_u32(info->attrs[idx]);
 155 +
 156 +               result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi);
 157 +               if (result)
 158 +                       goto out;
 159 +       }
 160
 161         if (info->attrs[NL80211_ATTR_WIPHY_TX_POWER_SETTING]) {
 162                 struct wireless_dev *txp_wdev = wdev;