enum ieee80211_hw_flags
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## Name

enum ieee80211_hw_flags — hardware flags

## Synopsis

    enum ieee80211_hw_flags {
      IEEE80211_HW_HAS_RATE_CONTROL,
      IEEE80211_HW_RX_INCLUDES_FCS,
      IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING,
      IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE,
      IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE,
      IEEE80211_HW_SIGNAL_UNSPEC,
      IEEE80211_HW_SIGNAL_DBM,
      IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC,
      IEEE80211_HW_SPECTRUM_MGMT,
      IEEE80211_HW_AMPDU_AGGREGATION,
      IEEE80211_HW_SUPPORTS_PS,
      IEEE80211_HW_PS_NULLFUNC_STACK,
      IEEE80211_HW_SUPPORTS_DYNAMIC_PS,
      IEEE80211_HW_MFP_CAPABLE,
      IEEE80211_HW_WANT_MONITOR_VIF,
      IEEE80211_HW_SUPPORTS_STATIC_SMPS,
      IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS,
      IEEE80211_HW_SUPPORTS_UAPSD,
      IEEE80211_HW_REPORTS_TX_ACK_STATUS,
      IEEE80211_HW_CONNECTION_MONITOR,
      IEEE80211_HW_QUEUE_CONTROL,
      IEEE80211_HW_SUPPORTS_PER_STA_GTK,
      IEEE80211_HW_AP_LINK_PS,
      IEEE80211_HW_TX_AMPDU_SETUP_IN_HW,
      IEEE80211_HW_SUPPORTS_RC_TABLE,
      IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF,
      IEEE80211_HW_TIMING_BEACON_ONLY,
      IEEE80211_HW_SUPPORTS_HT_CCK_RATES,
      IEEE80211_HW_CHANCTX_STA_CSA
    };

## Constants

IEEE80211_HW_HAS_RATE_CONTROL

  The hardware or firmware includes rate control, and cannot be controlled by the stack. As such, no rate control algorithm should be instantiated, and the TX rate reported to userspace will be taken from the TX status instead of the rate control algorithm. Note that this requires that the driver implement a number of callbacks so it has the correct information, it needs to have the `set_rts_threshold` callback and must look at the BSS config `use_cts_prot` for G/N protection, `use_short_slot` for slot timing in 2.4 GHz and `use_short_preamble` for preambles for CCK frames.

IEEE80211_HW_RX_INCLUDES_FCS

  Indicates that received frames passed to the stack include the FCS at the end.

IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING

  Some wireless LAN chipsets buffer broadcast/multicast frames for power saving stations in the hardware/firmware and others rely on the host system for such buffering. This option is used to configure the IEEE 802.11 upper layer to buffer broadcast and multicast frames when there are power saving stations so that the driver can fetch them with `ieee80211_get_buffered_bc`.

IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE

  Hardware is not capable of short slot operation on the 2.4 GHz band.

IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE

  Hardware is not capable of receiving frames with short preamble on the 2.4 GHz band.

IEEE80211_HW_SIGNAL_UNSPEC

  Hardware can provide signal values but we don't know its units. We expect values between 0 and `max_signal`. If possible please provide dB or dBm instead.

IEEE80211_HW_SIGNAL_DBM

  Hardware gives signal values in dBm, decibel difference from one milliwatt. This is the preferred method since it is standardized between different devices. `max_signal` does not need to be set.

IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC

  This device needs to get data from beacon before association (i.e. dtim_period).

IEEE80211_HW_SPECTRUM_MGMT

  Hardware supports spectrum management defined in 802.11h Measurement, Channel Switch, Quieting, TPC

IEEE80211_HW_AMPDU_AGGREGATION

  Hardware supports 11n A-MPDU aggregation.

IEEE80211_HW_SUPPORTS_PS

  Hardware has power save support (i.e. can go to sleep).

IEEE80211_HW_PS_NULLFUNC_STACK

  Hardware requires nullfunc frame handling in stack, implies stack support for dynamic PS.

IEEE80211_HW_SUPPORTS_DYNAMIC_PS

  Hardware has support for dynamic PS.

IEEE80211_HW_MFP_CAPABLE

  Hardware supports management frame protection (MFP, IEEE 802.11w).

IEEE80211_HW_WANT_MONITOR_VIF

  The driver would like to be informed of a virtual monitor interface when monitor interfaces are the only active interfaces.

IEEE80211_HW_SUPPORTS_STATIC_SMPS

  Hardware supports static spatial multiplexing powersave, ie. can turn off all but one chain even on HT connections that should be using more chains.

IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS

  Hardware supports dynamic spatial multiplexing powersave, ie. can turn off all but one chain and then wake the rest up as required after, for example, rts/cts handshake.

IEEE80211_HW_SUPPORTS_UAPSD

  Hardware supports Unscheduled Automatic Power Save Delivery (U-APSD) in managed mode. The mode is configured with `conf_tx` operation.

IEEE80211_HW_REPORTS_TX_ACK_STATUS

  Hardware can provide ack status reports of Tx frames to the stack.

IEEE80211_HW_CONNECTION_MONITOR

  The hardware performs its own connection monitoring, including periodic keep-alives to the AP and probing the AP on beacon loss.

IEEE80211_HW_QUEUE_CONTROL

  The driver wants to control per-interface queue mapping in order to use different queues (not just one per AC) for different virtual interfaces. See the doc section on HW queue control for more details.

IEEE80211_HW_SUPPORTS_PER_STA_GTK

  The device's crypto engine supports per-station GTKs as used by IBSS RSN or during fast transition. If the device doesn't support per-station GTKs, but can be asked not to decrypt group addressed frames, then IBSS RSN support is still possible but software crypto will be used. Advertise the wiphy flag only in that case.

IEEE80211_HW_AP_LINK_PS

  When operating in AP mode the device autonomously manages the PS status of connected stations. When this flag is set mac80211 will not trigger PS mode for connected stations based on the PM bit of incoming frames. Use `ieee80211_start_ps`/`ieee8021_end_ps` to manually configure the PS mode of connected stations.

IEEE80211_HW_TX_AMPDU_SETUP_IN_HW

  The device handles TX A-MPDU session setup strictly in HW. mac80211 should not attempt to do this in software.

IEEE80211_HW_SUPPORTS_RC_TABLE

  The driver supports using a rate selection table provided by the rate control algorithm.

IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF

  Use the P2P Device address for any P2P Interface. This will be honoured even if more than one interface is supported.

IEEE80211_HW_TIMING_BEACON_ONLY

  Use sync timing from beacon frames only, to allow getting TBTT of a DTIM beacon.

IEEE80211_HW_SUPPORTS_HT_CCK_RATES

  Hardware supports mixing HT/CCK rates and can cope with CCK rates in an aggregation session (e.g. by not using aggregation for such frames.)

IEEE80211_HW_CHANCTX_STA_CSA

  Support 802.11h based channel-switch (CSA) for a single active channel while using channel contexts. When support is not enabled the default action is to disconnect when getting the CSA frame.

## Description

These flags are used to indicate hardware capabilities to the stack. Generally, flags here should have their meaning done in a way that the simplest hardware doesn't need setting any particular flags. There are some exceptions to this rule, however, so you are advised to review these flags carefully.

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