Return-path: Received: from wolverine01.qualcomm.com ([199.106.114.254]:56605 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751911AbdAaSvt (ORCPT ); Tue, 31 Jan 2017 13:51:49 -0500 From: Ashok Raj Nagarajan To: CC: , , , Ashok Raj Nagarajan Subject: [PATCH v2 1/2] cfg80211: Add support to set tx power for a station associated Date: Wed, 1 Feb 2017 00:11:40 +0530 Message-ID: <1485888101-23454-1-git-send-email-arnagara@qti.qualcomm.com> (sfid-20170131_195309_790642_4BF46034) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: 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. Signed-off-by: Ashok Raj Nagarajan --- v2: - refactor the shared code - "keep what you had" using STATION_PARAM_APPLY_* BIT - feature flag to let the user know if this feature is supported or not (Johannes) include/net/cfg80211.h | 6 ++++++ include/uapi/linux/nl80211.h | 15 +++++++++++++ net/wireless/nl80211.c | 50 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 814be4b..c989fbd 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -808,6 +808,7 @@ 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), }; /** @@ -849,6 +850,10 @@ enum station_parameters_apply_mask { * @opmode_notif: operating mode field from Operating Mode Notification * @opmode_notif_used: information if operating mode field is used * @support_p2p_ps: information if station supports P2P PS mechanism + * @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. */ struct station_parameters { const u8 *supported_rates; @@ -876,6 +881,7 @@ struct station_parameters { u8 opmode_notif; bool opmode_notif_used; int support_p2p_ps; + unsigned int txpwr; }; /** diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 6b76e3b..de2f72c 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -1980,6 +1980,15 @@ enum nl80211_commands { * @NL80211_ATTR_BSSID: The BSSID of the AP. Note that %NL80211_ATTR_MAC is also * used in various commands/events for specifying the BSSID. * + * @NL80211_ATTR_STA_TX_POWER_SETTING: Transmit power setting type (u32) for + * station associated with the AP. See &enum nl80211_tx_power_setting for + * possible values. + * @NL80211_ATTR_STA_TX_POWER: Transmit power level (u32) 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 @@ -2386,6 +2395,9 @@ enum nl80211_attrs { NL80211_ATTR_BSSID, + NL80211_ATTR_STA_TX_POWER_SETTING, + NL80211_ATTR_STA_TX_POWER, + /* add attributes here, update the policy in nl80211.c */ __NL80211_ATTR_AFTER_LAST, @@ -4697,6 +4709,8 @@ enum nl80211_feature_flags { * configuration (AP/mesh) with VHT rates. * @NL80211_EXT_FEATURE_FILS_STA: This driver supports Fast Initial Link Setup * with user space SME (NL80211_CMD_AUTHENTICATE) in station mode. + * @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. @@ -4712,6 +4726,7 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_BEACON_RATE_HT, NL80211_EXT_FEATURE_BEACON_RATE_VHT, NL80211_EXT_FEATURE_FILS_STA, + 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 ef5eff93..ace87de 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -246,6 +246,8 @@ enum nl80211_multicast_groups { [NL80211_ATTR_STA_SUPPORTED_RATES] = { .type = NLA_BINARY, .len = NL80211_MAX_SUPP_RATES }, [NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 }, + [NL80211_ATTR_STA_TX_POWER_SETTING] = { .type = NLA_U32 }, + [NL80211_ATTR_STA_TX_POWER] = { .type = NLA_U32 }, [NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 }, [NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ }, [NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY, @@ -4548,6 +4550,8 @@ int cfg80211_check_station_change(struct wiphy *wiphy, return -EINVAL; if (params->sta_modify_mask & STATION_PARAM_APPLY_CAPABILITY) return -EINVAL; + if (params->sta_modify_mask & STATION_PARAM_APPLY_STA_TXPOWER) + return -EINVAL; if (params->supported_rates) return -EINVAL; if (params->ext_capab || params->ht_capa || params->vht_capa) @@ -4755,6 +4759,40 @@ 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]; + enum nl80211_tx_power_setting type; + int idx; + + 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; + type = nla_get_u32(info->attrs[idx]); + + if (!info->attrs[NL80211_ATTR_STA_TX_POWER] && + (type != NL80211_TX_POWER_AUTOMATIC)) + return -EINVAL; + + if (type != NL80211_TX_POWER_AUTOMATIC) { + if (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; + } else { + return -EINVAL; + } + } else { + params->txpwr = 0; + } + return 0; +} + static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info) { struct cfg80211_registered_device *rdev = info->user_ptr[0]; @@ -4854,6 +4892,12 @@ static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info) params.local_pm = pm; } + if (info->attrs[NL80211_ATTR_STA_TX_POWER_SETTING]) { + 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) @@ -4981,6 +5025,12 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info) return -EINVAL; } + if (info->attrs[NL80211_ATTR_STA_TX_POWER_SETTING]) { + err = nl80211_parse_sta_txpower_setting(info, ¶ms); + if (err) + return err; + } + err = nl80211_parse_sta_channel_info(info, ¶ms); if (err) return err; -- 1.9.1