From 16ef1fe272332b2f7fd99236017b891db48d9cd6 Mon Sep 17 00:00:00 2001 From: Simon Wunderlich Date: Thu, 11 Jul 2013 16:09:05 +0200 Subject: nl80211/cfg80211: add channel switch command To allow channel switch announcements within beacons, add the channel switch command to nl80211/cfg80211. This is implementation is intended for AP and (later) IBSS mode. Signed-off-by: Simon Wunderlich Signed-off-by: Mathias Kretschmer Signed-off-by: Johannes Berg --- include/net/cfg80211.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'include/net') diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index aeaf6dff6e05..b7495c72061c 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -665,6 +665,30 @@ struct cfg80211_ap_settings { bool radar_required; }; +/** + * struct cfg80211_csa_settings - channel switch settings + * + * Used for channel switch + * + * @chandef: defines the channel to use after the switch + * @beacon_csa: beacon data while performing the switch + * @counter_offset_beacon: offset for the counter within the beacon (tail) + * @counter_offset_presp: offset for the counter within the probe response + * @beacon_after: beacon data to be used on the new channel + * @radar_required: whether radar detection is required on the new channel + * @block_tx: whether transmissions should be blocked while changing + * @count: number of beacons until switch + */ +struct cfg80211_csa_settings { + struct cfg80211_chan_def chandef; + struct cfg80211_beacon_data beacon_csa; + u16 counter_offset_beacon, counter_offset_presp; + struct cfg80211_beacon_data beacon_after; + bool radar_required; + bool block_tx; + u8 count; +}; + /** * enum station_parameters_apply_mask - station parameter values to apply * @STATION_PARAM_APPLY_UAPSD: apply new uAPSD parameters (uapsd_queues, max_sp) @@ -2139,6 +2163,8 @@ struct cfg80211_update_ft_ies_params { * @crit_proto_stop: Indicates critical protocol no longer needs increased link * reliability. This operation can not fail. * @set_coalesce: Set coalesce parameters. + * + * @channel_switch: initiate channel-switch procedure (with CSA) */ struct cfg80211_ops { int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow); @@ -2376,6 +2402,10 @@ struct cfg80211_ops { struct wireless_dev *wdev); int (*set_coalesce)(struct wiphy *wiphy, struct cfg80211_coalesce *coalesce); + + int (*channel_switch)(struct wiphy *wiphy, + struct net_device *dev, + struct cfg80211_csa_settings *params); }; /* @@ -2441,6 +2471,8 @@ struct cfg80211_ops { * @WIPHY_FLAG_OFFCHAN_TX: Device supports direct off-channel TX. * @WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL: Device supports remain-on-channel call. * @WIPHY_FLAG_SUPPORTS_5_10_MHZ: Device supports 5 MHz and 10 MHz channels. + * @WIPHY_FLAG_HAS_CHANNEL_SWITCH: Device supports channel switch in + * beaconing mode (AP, IBSS, Mesh, ...). */ enum wiphy_flags { WIPHY_FLAG_CUSTOM_REGULATORY = BIT(0), @@ -2465,6 +2497,7 @@ enum wiphy_flags { WIPHY_FLAG_OFFCHAN_TX = BIT(20), WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL = BIT(21), WIPHY_FLAG_SUPPORTS_5_10_MHZ = BIT(22), + WIPHY_FLAG_HAS_CHANNEL_SWITCH = BIT(23), }; /** -- cgit v1.2.3 From 73da7d5bab79ad7e16ff44d67c3fe8b9c0b33e5b Mon Sep 17 00:00:00 2001 From: Simon Wunderlich Date: Thu, 11 Jul 2013 16:09:06 +0200 Subject: mac80211: add channel switch command and beacon callbacks The count field in CSA must be decremented with each beacon transmitted. This patch implements the functionality for drivers using ieee80211_beacon_get(). Other drivers must call back manually after reaching count == 0. This patch also contains the handling and finish worker for the channel switch command, and mac80211/chanctx code to allow to change a channel definition of an active channel context. Signed-off-by: Simon Wunderlich Signed-off-by: Mathias Kretschmer [small cleanups, catch identical chandef] Signed-off-by: Johannes Berg --- include/net/mac80211.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'include/net') diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 3124036285eb..9cda3728c2cb 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -152,11 +152,14 @@ struct ieee80211_low_level_stats { * @IEEE80211_CHANCTX_CHANGE_WIDTH: The channel width changed * @IEEE80211_CHANCTX_CHANGE_RX_CHAINS: The number of RX chains changed * @IEEE80211_CHANCTX_CHANGE_RADAR: radar detection flag changed + * @IEEE80211_CHANCTX_CHANGE_CHANNEL: switched to another operating channel, + * this is used only with channel switching with CSA */ enum ieee80211_chanctx_change { IEEE80211_CHANCTX_CHANGE_WIDTH = BIT(0), IEEE80211_CHANCTX_CHANGE_RX_CHAINS = BIT(1), IEEE80211_CHANCTX_CHANGE_RADAR = BIT(2), + IEEE80211_CHANCTX_CHANGE_CHANNEL = BIT(3), }; /** @@ -1084,6 +1087,7 @@ enum ieee80211_vif_flags { * @addr: address of this interface * @p2p: indicates whether this AP or STA interface is a p2p * interface, i.e. a GO or p2p-sta respectively + * @csa_active: marks whether a channel switch is going on * @driver_flags: flags/capabilities the driver has for this interface, * these need to be set (or cleared) when the interface is added * or, if supported by the driver, the interface type is changed @@ -1106,6 +1110,7 @@ struct ieee80211_vif { struct ieee80211_bss_conf bss_conf; u8 addr[ETH_ALEN]; bool p2p; + bool csa_active; u8 cab_queue; u8 hw_queue[IEEE80211_NUM_ACS]; @@ -2637,6 +2642,16 @@ enum ieee80211_roc_type { * @ipv6_addr_change: IPv6 address assignment on the given interface changed. * Currently, this is only called for managed or P2P client interfaces. * This callback is optional; it must not sleep. + * + * @channel_switch_beacon: Starts a channel switch to a new channel. + * Beacons are modified to include CSA or ECSA IEs before calling this + * function. The corresponding count fields in these IEs must be + * decremented, and when they reach zero the driver must call + * ieee80211_csa_finish(). Drivers which use ieee80211_beacon_get() + * get the csa counter decremented by mac80211, but must check if it is + * zero using ieee80211_csa_is_complete() after the beacon has been + * transmitted and then call ieee80211_csa_finish(). + * */ struct ieee80211_ops { void (*tx)(struct ieee80211_hw *hw, @@ -2824,6 +2839,9 @@ struct ieee80211_ops { struct ieee80211_vif *vif, struct inet6_dev *idev); #endif + void (*channel_switch_beacon)(struct ieee80211_hw *hw, + struct ieee80211_vif *vif, + struct cfg80211_chan_def *chandef); }; /** @@ -3318,6 +3336,25 @@ static inline struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, return ieee80211_beacon_get_tim(hw, vif, NULL, NULL); } +/** + * ieee80211_csa_finish - notify mac80211 about channel switch + * @vif: &struct ieee80211_vif pointer from the add_interface callback. + * + * After a channel switch announcement was scheduled and the counter in this + * announcement hit zero, this function must be called by the driver to + * notify mac80211 that the channel can be changed. + */ +void ieee80211_csa_finish(struct ieee80211_vif *vif); + +/** + * ieee80211_csa_is_complete - find out if counters reached zero + * @vif: &struct ieee80211_vif pointer from the add_interface callback. + * + * This function returns whether the channel switch counters reached zero. + */ +bool ieee80211_csa_is_complete(struct ieee80211_vif *vif); + + /** * ieee80211_proberesp_get - retrieve a Probe Response template * @hw: pointer obtained from ieee80211_alloc_hw(). -- cgit v1.2.3