From: Ashok Raj Nagarajan <arnagara@xxxxxxxxxxxxxx>
This patch adds support to set transmit power setting type and transmit
power level attributes to NL80211_CMD_SET_STATION in order to facilitate
adjusting the transmit power level of a station associated to the AP.
The added attributes allow selection of automatic and limited transmit
power level, with the level defined in dBm format.
Co-developed-by: Balaji Pothunoori <bpothuno@xxxxxxxxxxxxxx>
Signed-off-by: Ashok Raj Nagarajan <arnagara@xxxxxxxxxxxxxx>
Signed-off-by: Balaji Pothunoori <bpothuno@xxxxxxxxxxxxxx>
---
v2: add txpwr structure
replaced nla_get_u32 with nla_get_u8/s16
added NLA_POLICY_RANGE check
v3: updated kernel-doc for sta_txpwr
structure and rebased
v4: added attribute check for tx power
include/net/cfg80211.h | 22 ++++++++++++++++++++++
include/uapi/linux/nl80211.h | 14 ++++++++++++++
net/wireless/nl80211.c | 43 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 79 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index bb307a1..5413a58 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -973,6 +973,27 @@ enum station_parameters_apply_mask {
STATION_PARAM_APPLY_UAPSD = BIT(0),
STATION_PARAM_APPLY_CAPABILITY = BIT(1),
STATION_PARAM_APPLY_PLINK_STATE = BIT(2),
+ STATION_PARAM_APPLY_STA_TXPOWER = BIT(3),
+};
+
+/**
+ * struct sta_txpwr - station txpower configuration
+ *
+ * Used to configure txpower for station.
+ *
+ * @power: tx power (in dBm) to be used for sending data traffic. If tx power
+ * is not provided, the default per-interface tx power setting will be
+ * overriding. Driver should be picking up the lowest tx power, either tx
+ * power per-interface or per-station.
+ * @type: In particular if TPC %type is NL80211_TX_POWER_LIMITED then tx power
+ * will be less than or equal to specified from userspace, whereas if TPC
+ * %type is NL80211_TX_POWER_AUTOMATIC then it indicates default tx power.
+ * NL80211_TX_POWER_FIXED is not a valid configuration option for
+ * per peer TPC.
+ */
+struct sta_txpwr {
+ s16 power;
+ enum nl80211_tx_power_setting type;
};
/**
@@ -1047,6 +1068,7 @@ struct station_parameters {
const struct ieee80211_he_cap_elem *he_capa;
u8 he_capa_len;
u16 airtime_weight;
+ struct sta_txpwr txpwr;
};
/**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index dd4f86e..83040c6 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2308,6 +2308,15 @@ enum nl80211_commands {
* @NL80211_ATTR_AIRTIME_WEIGHT: Station's weight when scheduled by the airtime
* scheduler.
*
+ * @NL80211_ATTR_STA_TX_POWER_SETTING: Transmit power setting type (u8) for
+ * station associated with the AP. See &enum nl80211_tx_power_setting for
+ * possible values.
+ * @NL80211_ATTR_STA_TX_POWER: Transmit power level (s16) in dBm units. This
+ * allows to set Tx power for a station. If this attribute is not included,
+ * the default per-interface tx power setting will be overriding. Driver
+ * should be picking up the lowest tx power, either tx power per-interface
+ * or per-station.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2758,6 +2767,8 @@ enum nl80211_attrs {
NL80211_ATTR_PEER_MEASUREMENTS,
NL80211_ATTR_AIRTIME_WEIGHT,
+ NL80211_ATTR_STA_TX_POWER_SETTING,
+ NL80211_ATTR_STA_TX_POWER,
/* add attributes here, update the policy in nl80211.c */
@@ -5343,6 +5354,8 @@ enum nl80211_feature_flags {
* @NL80211_EXT_FEATURE_AP_PMKSA_CACHING: Driver/device supports PMKSA caching
* (set/del PMKSA operations) in AP mode.
*
+ * @NL80211_EXT_FEATURE_STA_TX_PWR: This driver supports controlling tx power
+ 8 to a station.
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
*/
@@ -5384,6 +5397,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS,
NL80211_EXT_FEATURE_AP_PMKSA_CACHING,
+ NL80211_EXT_FEATURE_STA_TX_PWR,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 25a9e3b..a6e9cea 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -331,6 +331,11 @@ const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
.len = NL80211_MAX_SUPP_RATES },
[NL80211_ATTR_STA_PLINK_ACTION] =
NLA_POLICY_MAX(NLA_U8, NUM_NL80211_PLINK_ACTIONS - 1),
+ [NL80211_ATTR_STA_TX_POWER_SETTING] =
+ NLA_POLICY_RANGE(NLA_U8,
+ NL80211_TX_POWER_AUTOMATIC,
+ NL80211_TX_POWER_FIXED),
+ [NL80211_ATTR_STA_TX_POWER] = { .type = NLA_S16 },
[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
@@ -5387,6 +5392,36 @@ static int nl80211_set_station_tdls(struct genl_info *info,
return nl80211_parse_sta_wme(info, params);
}
+static int nl80211_parse_sta_txpower_setting(struct genl_info *info,
+ struct station_parameters *params)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ int idx;
+
+ if (info->attrs[NL80211_ATTR_STA_TX_POWER_SETTING]) {
+ if (!rdev->ops->set_tx_power ||
+ !wiphy_ext_feature_isset(&rdev->wiphy,
+ NL80211_EXT_FEATURE_STA_TX_PWR))
+ return -EOPNOTSUPP;
+
+ idx = NL80211_ATTR_STA_TX_POWER_SETTING;
+ params->txpwr.type = nla_get_u8(info->attrs[idx]);
+
+ if (params->txpwr.type == NL80211_TX_POWER_LIMITED) {
+ idx = NL80211_ATTR_STA_TX_POWER;
+
+ if (info->attrs[idx])
+ params->txpwr.power =
+ nla_get_s16(info->attrs[idx]);
+ else
+ return -EINVAL;
+ }
+ params->sta_modify_mask |= STATION_PARAM_APPLY_STA_TXPOWER;
+ }
+
+ return 0;
+}
+
static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -5480,6 +5515,10 @@ static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
return -EOPNOTSUPP;
+ err = nl80211_parse_sta_txpower_setting(info, ¶ms);
+ if (err)
+ return err;
+
/* Include parameters for TDLS peer (will check later) */
err = nl80211_set_station_tdls(info, ¶ms);
if (err)
@@ -5617,6 +5656,10 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
return -EOPNOTSUPP;
+ err = nl80211_parse_sta_txpower_setting(info, ¶ms);
+ if (err)
+ return err;
+
err = nl80211_parse_sta_channel_info(info, ¶ms);
if (err)
return err;
--
2.7.4
