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160 lines
5.1 KiB
160 lines
5.1 KiB
--- a/include/net/cfg80211.h
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+++ b/include/net/cfg80211.h
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@@ -2245,6 +2245,7 @@ struct cfg80211_qos_map {
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* (as advertised by the nl80211 feature flag.)
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* @get_tx_power: store the current TX power into the dbm variable;
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* return 0 if successful
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+ * @set_antenna_gain: set antenna gain to reduce maximum tx power if necessary
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*
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* @set_wds_peer: set the WDS peer for a WDS interface
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*
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@@ -2495,6 +2496,7 @@ struct cfg80211_ops {
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enum nl80211_tx_power_setting type, int mbm);
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int (*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
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int *dbm);
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+ int (*set_antenna_gain)(struct wiphy *wiphy, int dbi);
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int (*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev,
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const u8 *addr);
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--- a/include/net/mac80211.h
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+++ b/include/net/mac80211.h
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@@ -1078,6 +1078,7 @@ enum ieee80211_smps_mode {
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*
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* @power_level: requested transmit power (in dBm), backward compatibility
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* value only that is set to the minimum of all interfaces
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+ * @max_antenna_gain: maximum antenna gain adjusted by user config (in dBi)
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*
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* @chandef: the channel definition to tune to
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* @radar_enabled: whether radar detection is enabled
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@@ -1099,6 +1100,7 @@ struct ieee80211_conf {
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u32 flags;
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int power_level, dynamic_ps_timeout;
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int max_sleep_period;
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+ int max_antenna_gain;
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u16 listen_interval;
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u8 ps_dtim_period;
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--- a/include/uapi/linux/nl80211.h
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+++ b/include/uapi/linux/nl80211.h
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@@ -1656,6 +1656,9 @@ enum nl80211_commands {
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* @NL80211_ATTR_SMPS_MODE: SMPS mode to use (ap mode). see
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* &enum nl80211_smps_mode.
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*
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+ * @NL80211_ATTR_WIPHY_ANTENNA_GAIN: Configured antenna gain. Used to reduce
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+ * transmit power to stay within regulatory limits. u32, dBi.
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+ *
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* @NL80211_ATTR_MAX: highest attribute number currently defined
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* @__NL80211_ATTR_AFTER_LAST: internal use
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*/
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@@ -2008,6 +2011,8 @@ enum nl80211_attrs {
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NL80211_ATTR_SMPS_MODE,
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+ NL80211_ATTR_WIPHY_ANTENNA_GAIN,
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+
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/* add attributes here, update the policy in nl80211.c */
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__NL80211_ATTR_AFTER_LAST,
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--- a/net/mac80211/cfg.c
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+++ b/net/mac80211/cfg.c
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@@ -2155,6 +2155,19 @@ static int ieee80211_get_tx_power(struct
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return 0;
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}
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+static int ieee80211_set_antenna_gain(struct wiphy *wiphy, int dbi)
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+{
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+ struct ieee80211_local *local = wiphy_priv(wiphy);
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+
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+ if (dbi < 0)
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+ return -EINVAL;
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+
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+ local->user_antenna_gain = dbi;
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+ ieee80211_hw_config(local, 0);
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+
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+ return 0;
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+}
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+
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static int ieee80211_set_wds_peer(struct wiphy *wiphy, struct net_device *dev,
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const u8 *addr)
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{
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@@ -3723,6 +3736,7 @@ const struct cfg80211_ops mac80211_confi
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.set_wiphy_params = ieee80211_set_wiphy_params,
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.set_tx_power = ieee80211_set_tx_power,
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.get_tx_power = ieee80211_get_tx_power,
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+ .set_antenna_gain = ieee80211_set_antenna_gain,
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.set_wds_peer = ieee80211_set_wds_peer,
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.rfkill_poll = ieee80211_rfkill_poll,
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CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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@@ -1339,6 +1339,7 @@ struct ieee80211_local {
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int dynamic_ps_forced_timeout;
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int user_power_level; /* in dBm, for all interfaces */
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+ int user_antenna_gain; /* in dBi */
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enum ieee80211_smps_mode smps_mode;
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--- a/net/mac80211/main.c
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+++ b/net/mac80211/main.c
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@@ -98,7 +98,7 @@ static u32 ieee80211_hw_conf_chan(struct
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struct ieee80211_sub_if_data *sdata;
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struct cfg80211_chan_def chandef = {};
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u32 changed = 0;
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- int power;
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+ int power, max_power;
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u32 offchannel_flag;
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offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
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@@ -155,6 +155,12 @@ static u32 ieee80211_hw_conf_chan(struct
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}
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rcu_read_unlock();
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+ max_power = chandef.chan->max_reg_power;
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+ if (local->user_antenna_gain > 0) {
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+ max_power -= local->user_antenna_gain;
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+ power = min(power, max_power);
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+ }
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+
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if (local->hw.conf.power_level != power) {
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changed |= IEEE80211_CONF_CHANGE_POWER;
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local->hw.conf.power_level = power;
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@@ -578,6 +584,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_
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IEEE80211_RADIOTAP_MCS_HAVE_BW;
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local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
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IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
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+ local->user_antenna_gain = 0;
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local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
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local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
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local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
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--- a/net/wireless/nl80211.c
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+++ b/net/wireless/nl80211.c
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@@ -395,6 +395,7 @@ static const struct nla_policy nl80211_p
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[NL80211_ATTR_USER_PRIO] = { .type = NLA_U8 },
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[NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 },
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[NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 },
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+ [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 },
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};
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/* policy for the key attributes */
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@@ -2184,6 +2185,20 @@ static int nl80211_set_wiphy(struct sk_b
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return result;
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}
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+ if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) {
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+ int idx, dbi = 0;
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+
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+ if (!rdev->ops->set_antenna_gain)
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+ return -EOPNOTSUPP;
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+
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+ idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN;
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+ dbi = nla_get_u32(info->attrs[idx]);
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+
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+ result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi);
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+ if (result)
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+ return result;
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+ }
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+
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if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
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info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {
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u32 tx_ant, rx_ant;
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