--- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2156,6 +2156,7 @@ struct cfg80211_qos_map { * (as advertised by the nl80211 feature flag.) * @get_tx_power: store the current TX power into the dbm variable; * return 0 if successful + * @set_antenna_gain: set antenna gain to reduce maximum tx power if necessary * * @set_wds_peer: set the WDS peer for a WDS interface * @@ -2380,6 +2381,7 @@ struct cfg80211_ops { enum nl80211_tx_power_setting type, int mbm); int (*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev, int *dbm); + int (*set_antenna_gain)(struct wiphy *wiphy, int dbi); int (*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev, const u8 *addr); --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1033,6 +1033,7 @@ enum ieee80211_smps_mode { * * @power_level: requested transmit power (in dBm), backward compatibility * value only that is set to the minimum of all interfaces + * @max_antenna_gain: maximum antenna gain adjusted by user config (in dBi) * * @chandef: the channel definition to tune to * @radar_enabled: whether radar detection is enabled @@ -1054,6 +1055,7 @@ struct ieee80211_conf { u32 flags; int power_level, dynamic_ps_timeout; int max_sleep_period; + int max_antenna_gain; u16 listen_interval; u8 ps_dtim_period; --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -1555,6 +1555,9 @@ enum nl80211_commands { * data is in the format defined for the payload of the QoS Map Set element * in IEEE Std 802.11-2012, 8.4.2.97. * + * @NL80211_ATTR_WIPHY_ANTENNA_GAIN: Configured antenna gain. Used to reduce + * transmit power to stay within regulatory limits. u32, dBi. + * * @NL80211_ATTR_MAX: highest attribute number currently defined * @__NL80211_ATTR_AFTER_LAST: internal use */ @@ -1883,6 +1886,8 @@ enum nl80211_attrs { NL80211_ATTR_QOS_MAP, + NL80211_ATTR_WIPHY_ANTENNA_GAIN, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2336,6 +2336,19 @@ static int ieee80211_get_tx_power(struct return 0; } +static int ieee80211_set_antenna_gain(struct wiphy *wiphy, int dbi) +{ + struct ieee80211_local *local = wiphy_priv(wiphy); + + if (dbi < 0) + return -EINVAL; + + local->user_antenna_gain = dbi; + ieee80211_hw_config(local, 0); + + return 0; +} + static int ieee80211_set_wds_peer(struct wiphy *wiphy, struct net_device *dev, const u8 *addr) { @@ -3921,6 +3934,7 @@ struct cfg80211_ops mac80211_config_ops .set_wiphy_params = ieee80211_set_wiphy_params, .set_tx_power = ieee80211_set_tx_power, .get_tx_power = ieee80211_get_tx_power, + .set_antenna_gain = ieee80211_set_antenna_gain, .set_wds_peer = ieee80211_set_wds_peer, .rfkill_poll = ieee80211_rfkill_poll, CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd) --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -1221,6 +1221,7 @@ struct ieee80211_local { int dynamic_ps_forced_timeout; int user_power_level; /* in dBm, for all interfaces */ + int user_antenna_gain; /* in dBi */ enum ieee80211_smps_mode smps_mode; --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -101,7 +101,7 @@ static u32 ieee80211_hw_conf_chan(struct struct ieee80211_sub_if_data *sdata; struct cfg80211_chan_def chandef = {}; u32 changed = 0; - int power; + int power, ant_gain, max_power; u32 offchannel_flag; offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; @@ -156,8 +156,21 @@ static u32 ieee80211_hw_conf_chan(struct } rcu_read_unlock(); - if (local->hw.conf.power_level != power) { + max_power = chandef.chan->max_reg_power; + ant_gain = chandef.chan->max_antenna_gain; + if (local->user_antenna_gain > 0) { + if (local->user_antenna_gain > ant_gain) { + max_power -= local->user_antenna_gain - ant_gain; + ant_gain = 0; + } else + ant_gain -= local->user_antenna_gain; + power = min(power, max_power); + } + + if (local->hw.conf.power_level != power || + local->hw.conf.max_antenna_gain != ant_gain) { changed |= IEEE80211_CONF_CHANGE_POWER; + local->hw.conf.max_antenna_gain = ant_gain; local->hw.cur_power_level = power; local->hw.conf.power_level = power; } @@ -584,6 +597,7 @@ struct ieee80211_hw *ieee80211_alloc_hw( IEEE80211_RADIOTAP_MCS_HAVE_BW; local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI | IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; + local->user_antenna_gain = 0; local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES; local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN; local->user_power_level = IEEE80211_UNSET_POWER_LEVEL; --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -384,6 +384,7 @@ static const struct nla_policy nl80211_p [NL80211_ATTR_VENDOR_DATA] = { .type = NLA_BINARY }, [NL80211_ATTR_QOS_MAP] = { .type = NLA_BINARY, .len = IEEE80211_QOS_MAP_LEN_MAX }, + [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 }, }; /* policy for the key attributes */ @@ -2105,6 +2106,22 @@ static int nl80211_set_wiphy(struct sk_b goto bad_res; } + if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) { + int idx, dbi = 0; + + if (!rdev->ops->set_antenna_gain) { + result = -EOPNOTSUPP; + goto bad_res; + } + + idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN; + dbi = nla_get_u32(info->attrs[idx]); + + result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi); + if (result) + goto bad_res; + } + if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] && info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) { u32 tx_ant, rx_ant;