Merge branch 'master' of git://nbd.name/openwrt
[openwrt.git] / package / kernel / mac80211 / patches / 522-mac80211_configure_antenna_gain.patch
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--- 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;
 
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