package/kernel/mac80211/patches/522-mac80211_configure_antenna_gain.patch

   1 --- a/include/net/cfg80211.h
   2 +++ b/include/net/cfg80211.h
   3 @@ -2156,6 +2156,7 @@ struct cfg80211_qos_map {
   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   * @set_wds_peer: set the WDS peer for a WDS interface
  10   *
  11 @@ -2380,6 +2381,7 @@ 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         int     (*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev,
  18                                 const u8 *addr);
  19 --- a/include/net/mac80211.h
  20 +++ b/include/net/mac80211.h
  21 @@ -1033,6 +1033,7 @@ 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 @@ -1054,6 +1055,7 @@ struct ieee80211_conf {
  30         u32 flags;
  31         int power_level, dynamic_ps_timeout;
  32         int max_sleep_period;
  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 @@ -1555,6 +1555,9 @@ enum nl80211_commands {
  40   *     data is in the format defined for the payload of the QoS Map Set element
  41   *     in IEEE Std 802.11-2012, 8.4.2.97.
  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   * @NL80211_ATTR_MAX: highest attribute number currently defined
  47   * @__NL80211_ATTR_AFTER_LAST: internal use
  48   */
  49 @@ -1883,6 +1886,8 @@ enum nl80211_attrs {
  50
  51         NL80211_ATTR_QOS_MAP,
  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 @@ -2333,6 +2333,19 @@ 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 int ieee80211_set_wds_peer(struct wiphy *wiphy, struct net_device *dev,
  78                                   const u8 *addr)
  79  {
  80 @@ -3916,6 +3929,7 @@ struct cfg80211_ops mac80211_config_ops
  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         .set_wds_peer = ieee80211_set_wds_peer,
  86         .rfkill_poll = ieee80211_rfkill_poll,
  87         CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
  88 --- a/net/mac80211/ieee80211_i.h
  89 +++ b/net/mac80211/ieee80211_i.h
  90 @@ -1216,6 +1216,7 @@ 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 @@ -97,7 +97,7 @@ 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, ant_gain, max_power;
 106         u32 offchannel_flag;
 107
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109 @@ -152,8 +152,21 @@ static u32 ieee80211_hw_conf_chan(struct
 110         }
 111         rcu_read_unlock();
 112
 113 -       if (local->hw.conf.power_level != power) {
 114 +       max_power = chandef.chan->max_reg_power;
 115 +       ant_gain = chandef.chan->max_antenna_gain;
 116 +       if (local->user_antenna_gain > 0) {
 117 +               if (local->user_antenna_gain > ant_gain) {
 118 +                       max_power -= local->user_antenna_gain - ant_gain;
 119 +                       ant_gain = 0;
 120 +               } else
 121 +                       ant_gain -= local->user_antenna_gain;
 122 +               power = min(power, max_power);
 123 +       }
 124 +
 125 +       if (local->hw.conf.power_level != power ||
 126 +           local->hw.conf.max_antenna_gain != ant_gain) {
 127                 changed |= IEEE80211_CONF_CHANGE_POWER;
 128 +               local->hw.conf.max_antenna_gain = ant_gain;
 129                 local->hw.cur_power_level = power;
 130                 local->hw.conf.power_level = power;
 131         }
 132 @@ -580,6 +593,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(
 133                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 134         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 135                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 136 +       local->user_antenna_gain = 0;
 137         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 138         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 139         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 140 --- a/net/wireless/nl80211.c
 141 +++ b/net/wireless/nl80211.c
 142 @@ -384,6 +384,7 @@ static const struct nla_policy nl80211_p
 143         [NL80211_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
 144         [NL80211_ATTR_QOS_MAP] = { .type = NLA_BINARY,
 145                                    .len = IEEE80211_QOS_MAP_LEN_MAX },
 146 +       [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 },
 147  };
 148
 149  /* policy for the key attributes */
 150 @@ -2105,6 +2106,22 @@ static int nl80211_set_wiphy(struct sk_b
 151                         goto bad_res;
 152         }
 153
 154 +       if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) {
 155 +               int idx, dbi = 0;
 156 +
 157 +               if (!rdev->ops->set_antenna_gain) {
 158 +                       result = -EOPNOTSUPP;
 159 +                       goto bad_res;
 160 +               }
 161 +
 162 +               idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN;
 163 +               dbi = nla_get_u32(info->attrs[idx]);
 164 +
 165 +               result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi);
 166 +               if (result)
 167 +                       goto bad_res;
 168 +       }
 169 +
 170         if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
 171             info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {
 172                 u32 tx_ant, rx_ant;