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

   1 --- a/include/net/cfg80211.h
   2 +++ b/include/net/cfg80211.h
   3 @@ -4092,6 +4092,7 @@ 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 @@ -4442,6 +4443,7 @@ 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 @@ -1705,6 +1705,7 @@ 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 @@ -1725,6 +1726,7 @@ 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 @@ -2756,6 +2756,8 @@ enum nl80211_commands {
  40   *     bit corresponds to the lowest 20 MHz channel. Each bit set to 1
  41   *     indicates that the sub-channel is punctured. Higher 16 bits are
  42   *     reserved.
  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 @@ -3288,6 +3290,8 @@ enum nl80211_attrs {
  49
  50         NL80211_ATTR_PUNCT_BITMAP,
  51
  52 +       NL80211_ATTR_WIPHY_ANTENNA_GAIN,
  53 +
  54         /* add attributes here, update the policy in nl80211.c */
  55
  56         __NL80211_ATTR_AFTER_LAST,
  57 --- a/net/mac80211/cfg.c
  58 +++ b/net/mac80211/cfg.c
  59 @@ -3067,6 +3067,19 @@ static int ieee80211_get_tx_power(struct
  60         return 0;
  61  }
  62
  63 +static int ieee80211_set_antenna_gain(struct wiphy *wiphy, int dbi)
  64 +{
  65 +       struct ieee80211_local *local = wiphy_priv(wiphy);
  66 +
  67 +       if (dbi < 0)
  68 +               return -EINVAL;
  69 +
  70 +       local->user_antenna_gain = dbi;
  71 +       ieee80211_hw_config(local, 0);
  72 +
  73 +       return 0;
  74 +}
  75 +
  76  static void ieee80211_rfkill_poll(struct wiphy *wiphy)
  77  {
  78         struct ieee80211_local *local = wiphy_priv(wiphy);
  79 @@ -4989,6 +5002,7 @@ const struct cfg80211_ops mac80211_confi
  80         .set_wiphy_params = ieee80211_set_wiphy_params,
  81         .set_tx_power = ieee80211_set_tx_power,
  82         .get_tx_power = ieee80211_get_tx_power,
  83 +       .set_antenna_gain = ieee80211_set_antenna_gain,
  84         .rfkill_poll = ieee80211_rfkill_poll,
  85         CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
  86         CFG80211_TESTMODE_DUMP(ieee80211_testmode_dump)
  87 --- a/net/mac80211/ieee80211_i.h
  88 +++ b/net/mac80211/ieee80211_i.h
  89 @@ -1542,6 +1542,7 @@ struct ieee80211_local {
  90         int dynamic_ps_forced_timeout;
  91
  92         int user_power_level; /* in dBm, for all interfaces */
  93 +       int user_antenna_gain; /* in dBi */
  94
  95         enum ieee80211_smps_mode smps_mode;
  96
  97 --- a/net/mac80211/main.c
  98 +++ b/net/mac80211/main.c
  99 @@ -96,7 +96,7 @@ static u32 ieee80211_hw_conf_chan(struct
 100         struct ieee80211_sub_if_data *sdata;
 101         struct cfg80211_chan_def chandef = {};
 102         u32 changed = 0;
 103 -       int power;
 104 +       int power, max_power;
 105         u32 offchannel_flag;
 106
 107         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 108 @@ -157,6 +157,12 @@ static u32 ieee80211_hw_conf_chan(struct
 109         }
 110         rcu_read_unlock();
 111
 112 +       max_power = chandef.chan->max_reg_power;
 113 +       if (local->user_antenna_gain > 0) {
 114 +               max_power -= local->user_antenna_gain;
 115 +               power = min(power, max_power);
 116 +       }
 117 +
 118         if (local->hw.conf.power_level != power) {
 119                 changed |= IEEE80211_CONF_CHANGE_POWER;
 120                 local->hw.conf.power_level = power;
 121 @@ -762,6 +768,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_
 122                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 123         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 124                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 125 +       local->user_antenna_gain = 0;
 126         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 127         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 128         local->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
 129 --- a/net/wireless/nl80211.c
 130 +++ b/net/wireless/nl80211.c
 131 @@ -800,6 +800,7 @@ static const struct nla_policy nl80211_p
 132         [NL80211_ATTR_MLO_SUPPORT] = { .type = NLA_FLAG },
 133         [NL80211_ATTR_MAX_NUM_AKM_SUITES] = { .type = NLA_REJECT },
 134         [NL80211_ATTR_PUNCT_BITMAP] = NLA_POLICY_RANGE(NLA_U8, 0, 0xffff),
 135 +       [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 },
 136  };
 137
 138  /* policy for the key attributes */
 139 @@ -3527,6 +3528,22 @@ static int nl80211_set_wiphy(struct sk_b
 140                 if (result)
 141                         goto out;
 142         }
 143 +
 144 +       if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) {
 145 +               int idx, dbi = 0;
 146 +
 147 +               if (!rdev->ops->set_antenna_gain) {
 148 +                       result = -EOPNOTSUPP;
 149 +                       goto out;
 150 +               }
 151 +
 152 +               idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN;
 153 +               dbi = nla_get_u32(info->attrs[idx]);
 154 +
 155 +               result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi);
 156 +               if (result)
 157 +                       goto out;
 158 +       }
 159
 160         if (info->attrs[NL80211_ATTR_WIPHY_TX_POWER_SETTING]) {
 161                 struct wireless_dev *txp_wdev = wdev;