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500-mac80211_configure_antenna_gain.patch
160 lines (147 loc) · 5.16 KB
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500-mac80211_configure_antenna_gain.patch
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--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3736,6 +3736,7 @@ struct mgmt_frame_regs {
* (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
*
@@ -4058,6 +4059,7 @@ 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
@@ -1561,6 +1561,7 @@ 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
@@ -1581,6 +1582,7 @@ enum ieee80211_smps_mode {
struct ieee80211_conf {
u32 flags;
int power_level, dynamic_ps_timeout;
+ int max_antenna_gain;
u16 listen_interval;
u8 ps_dtim_period;
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2531,6 +2531,9 @@ enum nl80211_commands {
* disassoc events to indicate that an immediate reconnect to the AP
* is desired.
*
+ * @NL80211_ATTR_WIPHY_ANTENNA_GAIN: Configured antenna gain. Used to reduce
+ * transmit power to stay within regulatory limits. u32, dBi.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3022,6 +3025,8 @@ enum nl80211_attrs {
NL80211_ATTR_RECONNECT_REQUESTED,
+ 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
@@ -2709,6 +2709,19 @@ 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)
{
@@ -4139,6 +4152,7 @@ const struct cfg80211_ops mac80211_confi
.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
@@ -1403,6 +1403,7 @@ 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
@@ -96,7 +96,7 @@ 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, max_power;
u32 offchannel_flag;
offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
@@ -157,6 +157,12 @@ static u32 ieee80211_hw_conf_chan(struct
}
rcu_read_unlock();
+ max_power = chandef.chan->max_reg_power;
+ if (local->user_antenna_gain > 0) {
+ max_power -= local->user_antenna_gain;
+ power = min(power, max_power);
+ }
+
if (local->hw.conf.power_level != power) {
changed |= IEEE80211_CONF_CHANGE_POWER;
local->hw.conf.power_level = power;
@@ -665,6 +671,7 @@ 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->hw.max_mtu = IEEE80211_MAX_DATA_LEN;
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -737,6 +737,7 @@ static const struct nla_policy nl80211_p
[NL80211_ATTR_S1G_CAPABILITY_MASK] =
NLA_POLICY_EXACT_LEN(IEEE80211_S1G_CAPABILITY_LEN),
[NL80211_ATTR_RECONNECT_REQUESTED] = { .type = NLA_REJECT },
+ [NL80211_ATTR_WIPHY_ANTENNA_GAIN] = { .type = NLA_U32 },
};
/* policy for the key attributes */
@@ -3245,6 +3246,20 @@ static int nl80211_set_wiphy(struct sk_b
if (result)
return result;
}
+
+ if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_GAIN]) {
+ int idx, dbi = 0;
+
+ if (!rdev->ops->set_antenna_gain)
+ return -EOPNOTSUPP;
+
+ idx = NL80211_ATTR_WIPHY_ANTENNA_GAIN;
+ dbi = nla_get_u32(info->attrs[idx]);
+
+ result = rdev->ops->set_antenna_gain(&rdev->wiphy, dbi);
+ if (result)
+ return result;
+ }
if (info->attrs[NL80211_ATTR_WIPHY_ANTENNA_TX] &&
info->attrs[NL80211_ATTR_WIPHY_ANTENNA_RX]) {