From: Ashok Raj Nagarajan <[email protected]>
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 mBm format.
Co-developed-by: Balaji Pothunoori <[email protected]>
Signed-off-by: Ashok Raj Nagarajan <[email protected]>
Signed-off-by: Balaji Pothunoori <[email protected]>
---
include/net/cfg80211.h | 12 ++++++++++++
include/uapi/linux/nl80211.h | 14 ++++++++++++++
net/wireless/nl80211.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 61 insertions(+)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ede7fcd..592f564 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -958,6 +958,7 @@ 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),
};
/**
@@ -1001,6 +1002,15 @@ enum station_parameters_apply_mask {
* @support_p2p_ps: information if station supports P2P PS mechanism
* @he_capa: HE capabilities of station
* @he_capa_len: the length of the HE capabilities
+ * @txpwr: tx power (in mBm) 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 txpwr will
+ * be less than or equal to specified from userspace, whereas if TPC %type
+ * is NL80211_TX_POWER_AUTOMATIC then it indicates default txpwr.
+ * NL80211_TX_POWER_FIXED is not a valid configuration option for
+ * per peer TPC.
*/
struct station_parameters {
const u8 *supported_rates;
@@ -1030,6 +1040,8 @@ struct station_parameters {
int support_p2p_ps;
const struct ieee80211_he_cap_elem *he_capa;
u8 he_capa_len;
+ s16 txpwr;
+ enum nl80211_tx_power_setting type;
};
/**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 2b53c0e..09c9e14 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2292,6 +2292,15 @@ enum nl80211_commands {
* This is also used for capability advertisement in the wiphy information,
* with the appropriate sub-attributes.
*
+ * @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 mBm 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
@@ -2740,6 +2749,8 @@ enum nl80211_attrs {
NL80211_ATTR_TIMEOUT,
NL80211_ATTR_PEER_MEASUREMENTS,
+ NL80211_ATTR_STA_TX_POWER_SETTING,
+ NL80211_ATTR_STA_TX_POWER,
/* add attributes here, update the policy in nl80211.c */
@@ -5308,6 +5319,8 @@ enum nl80211_feature_flags {
* able to rekey an in-use key correctly. Userspace must not rekey PTK keys
* if this flag is not set. Ignoring this can leak clear text packets and/or
* freeze the connection.
+ * @NL80211_EXT_FEATURE_STA_TX_PWR: This driver supports controlling tx power
+ * to a station.
*
* @NUM_NL80211_EXT_FEATURES: number of extended features.
* @MAX_NL80211_EXT_FEATURES: highest extended feature index.
@@ -5348,6 +5361,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
NL80211_EXT_FEATURE_CAN_REPLACE_PTK0,
NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
+ 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 e20329b..753ab51 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -347,6 +347,8 @@ 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] = { .type = NLA_U8 },
+ [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,
@@ -5377,6 +5379,31 @@ 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->type = nla_get_u32(info->attrs[idx]);
+
+ if (params->type == NL80211_TX_POWER_LIMITED) {
+ idx = NL80211_ATTR_STA_TX_POWER;
+ params->txpwr = nla_get_u32(info->attrs[idx]);
+ }
+ 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];
@@ -5461,6 +5488,10 @@ static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
nla_get_u8(info->attrs[NL80211_ATTR_OPMODE_NOTIF]);
}
+ 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)
@@ -5589,6 +5620,10 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
params.plink_action =
nla_get_u8(info->attrs[NL80211_ATTR_STA_PLINK_ACTION]);
+ 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
On Thu, 2019-01-17 at 16:52 +0530, Balaji Pothunoori wrote:
>
> + s16 txpwr;
> + enum nl80211_tx_power_setting type;
you should probably call this txpwr_type, or do something like
struct {
s16 power;
enum ... type;
} txpwr;
> + [NL80211_ATTR_STA_TX_POWER_SETTING] = { .type = NLA_U8 },
That should use NLA_POLICY_RANGE()
> + [NL80211_ATTR_STA_TX_POWER] = { .type = NLA_S16 },
> + params->type = nla_get_u32(info->attrs[idx]);
> +
> + if (params->type == NL80211_TX_POWER_LIMITED) {
> + idx = NL80211_ATTR_STA_TX_POWER;
> + params->txpwr = nla_get_u32(info->attrs[idx]);
You cannot use nla_get_u32 with U8/S16 attributes, use the correct
corresponding helper.
johannes