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cfg80211: Add support to set tx power for a station associated 

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@codeaurora.org>
Signed-off-by: Ashok Raj Nagarajan <arnagara@codeaurora.org>
Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ashok Raj Nagarajan 2019-03-29 16:18:21 +05:30 committed by Johannes Berg
parent dbd50a851c
commit e96d1cd263
3 changed files with 80 additions and 0 deletions
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22
include/net/cfg80211.h
View File

@ -975,6 +975,27 @@ 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;
};
/**
@ -1049,6 +1070,7 @@ struct station_parameters {
const struct ieee80211_he_cap_elem *he_capa;
u8 he_capa_len;
u16 airtime_weight;
struct sta_txpwr txpwr;
};
/**

15
include/uapi/linux/nl80211.h
View File

@ -2315,6 +2315,15 @@ 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
@ -2765,6 +2774,8 @@ 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 */
@ -5391,6 +5402,9 @@ enum nl80211_feature_flags {
* @NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD: Driver supports
* filtering of sched scan results using band specific RSSI thresholds.
*
* @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.
*/
@ -5434,6 +5448,7 @@ enum nl80211_ext_feature_index {
NL80211_EXT_FEATURE_AP_PMKSA_CACHING,
NL80211_EXT_FEATURE_SCHED_SCAN_BAND_SPECIFIC_RSSI_THOLD,
NL80211_EXT_FEATURE_EXT_KEY_ID,
NL80211_EXT_FEATURE_STA_TX_PWR,
/* add new features before the definition below */
NUM_NL80211_EXT_FEATURES,

43
net/wireless/nl80211.c
View File

@ -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,
@ -5420,6 +5425,36 @@ 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];
@ -5513,6 +5548,10 @@ 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, &params);
if (err)
return err;
/* Include parameters for TDLS peer (will check later) */
err = nl80211_set_station_tdls(info, &params);
if (err)
@ -5650,6 +5689,10 @@ 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, &params);
if (err)
return err;
err = nl80211_parse_sta_channel_info(info, &params);
if (err)
return err;