163 lines
5.3 KiB
Diff
163 lines
5.3 KiB
Diff
--- a/include/net/cfg80211.h
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+++ b/include/net/cfg80211.h
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@@ -3835,6 +3835,7 @@ struct mgmt_frame_regs {
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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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* @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
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* functions to adjust rfkill hw state
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@@ -4159,6 +4160,7 @@ 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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void (*rfkill_poll)(struct wiphy *wiphy);
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--- a/include/net/mac80211.h
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+++ b/include/net/mac80211.h
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@@ -1566,6 +1566,7 @@ 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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@@ -1586,6 +1587,7 @@ enum ieee80211_smps_mode {
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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_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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@@ -2593,6 +2593,9 @@ enum nl80211_commands {
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* @NL80211_ATTR_COLOR_CHANGE_ELEMS: Nested set of attributes containing the IE
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* information for the time while performing a color switch.
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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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* @NUM_NL80211_ATTR: total number of nl80211_attrs available
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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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@@ -3096,6 +3099,8 @@ enum nl80211_attrs {
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NL80211_ATTR_COLOR_CHANGE_COLOR,
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NL80211_ATTR_COLOR_CHANGE_ELEMS,
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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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@@ -2760,6 +2760,19 @@ 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 void ieee80211_rfkill_poll(struct wiphy *wiphy)
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{
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struct ieee80211_local *local = wiphy_priv(wiphy);
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@@ -4395,6 +4408,7 @@ 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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.rfkill_poll = ieee80211_rfkill_poll,
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CFG80211_TESTMODE_CMD(ieee80211_testmode_cmd)
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CFG80211_TESTMODE_DUMP(ieee80211_testmode_dump)
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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@@ -1429,6 +1429,7 @@ 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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@@ -96,7 +96,7 @@ 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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@@ -157,6 +157,12 @@ 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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@@ -679,6 +685,7 @@ 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->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
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--- a/net/wireless/nl80211.c
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+++ b/net/wireless/nl80211.c
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@@ -780,6 +780,7 @@ static const struct nla_policy nl80211_p
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[NL80211_ATTR_COLOR_CHANGE_COUNT] = { .type = NLA_U8 },
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[NL80211_ATTR_COLOR_CHANGE_COLOR] = { .type = NLA_U8 },
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[NL80211_ATTR_COLOR_CHANGE_ELEMS] = NLA_POLICY_NESTED(nl80211_policy),
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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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@@ -3324,6 +3325,22 @@ static int nl80211_set_wiphy(struct sk_b
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if (result)
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goto out;
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}
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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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+ result = -EOPNOTSUPP;
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+ goto out;
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+ }
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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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+ goto out;
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+ }
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if (info->attrs[NL80211_ATTR_WIPHY_TX_POWER_SETTING]) {
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struct wireless_dev *txp_wdev = wdev;
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