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ENUM IEEE80211_HW_FL(9) The basic mac80211 driver inte ENUM IEEE80211_HW_FL(9)

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_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_NO_AUTO_VIF,


  IEEE80211_HW_SW_CRYPTO_CONTROL,


  IEEE80211_HW_SUPPORT_FAST_XMIT,


  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,


  IEEE80211_HW_SUPPORTS_CLONED_SKBS,


  IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS,


  IEEE80211_HW_TDLS_WIDER_BW,


  IEEE80211_HW_SUPPORTS_AMSDU_IN_AMPDU,


  IEEE80211_HW_BEACON_TX_STATUS,


  IEEE80211_HW_NEEDS_UNIQUE_STA_ADDR,


  IEEE80211_HW_SUPPORTS_REORDERING_BUFFER,


  IEEE80211_HW_USES_RSS,


  IEEE80211_HW_TX_AMSDU,


  IEEE80211_HW_TX_FRAG_LIST,


  IEEE80211_HW_REPORTS_LOW_ACK,


  IEEE80211_HW_SUPPORTS_TX_FRAG,


  IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA,


  IEEE80211_HW_DEAUTH_NEED_MGD_TX_PREP,


  IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP,


  IEEE80211_HW_BUFF_MMPDU_TXQ,


  IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW,


  IEEE80211_HW_STA_MMPDU_TXQ,


  IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN,


  IEEE80211_HW_SUPPORTS_MULTI_BSSID,


  IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID,


  NUM_IEEE80211_HW_FLAGS
};

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_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_NO_AUTO_VIF

The driver would like for no wlanX to be created. It is expected user-space will create vifs as desired (and thus have them named as desired).

IEEE80211_HW_SW_CRYPTO_CONTROL

The driver wants to control which of the crypto algorithms can be done in software - so don't automatically try to fall back to it if hardware crypto fails, but do so only if the driver returns 1. This also forces the driver to advertise its supported cipher suites.

IEEE80211_HW_SUPPORT_FAST_XMIT

The driver/hardware supports fast-xmit, this currently requires only the ability to calculate the duration for frames.

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.

IEEE80211_HW_SUPPORTS_CLONED_SKBS

The driver will never modify the payload or tailroom of TX skbs without copying them first.

IEEE80211_HW_SINGLE_SCAN_ON_ALL_BANDS

The HW supports scanning on all bands in one command, mac80211 doesn't have to run separate scans per band.

IEEE80211_HW_TDLS_WIDER_BW

The device/driver supports wider bandwidth than then BSS bandwidth for a TDLS link on the base channel.

IEEE80211_HW_SUPPORTS_AMSDU_IN_AMPDU

The driver supports receiving A-MSDUs within A-MPDU.

IEEE80211_HW_BEACON_TX_STATUS

The device/driver provides TX status for sent beacons.

IEEE80211_HW_NEEDS_UNIQUE_STA_ADDR

Hardware (or driver) requires that each station has a unique address, i.e. each station entry can be identified by just its MAC address; this prevents, for example, the same station from connecting to two virtual AP interfaces at the same time.

IEEE80211_HW_SUPPORTS_REORDERING_BUFFER

Hardware (or driver) manages the reordering buffer internally, guaranteeing mac80211 receives frames in order and does not need to manage its own reorder buffer or BA session timeout.

IEEE80211_HW_USES_RSS

The device uses RSS and thus requires parallel RX, which implies using per-CPU station statistics.

IEEE80211_HW_TX_AMSDU

Hardware (or driver) supports software aggregated A-MSDU frames. Requires software tx queueing and fast-xmit support. When not using minstrel/minstrel_ht rate control, the driver must limit the maximum A-MSDU size based on the current tx rate by setting max_rc_amsdu_len in struct ieee80211_sta.

IEEE80211_HW_TX_FRAG_LIST

Hardware (or driver) supports sending frag_list skbs, needed for zero-copy software A-MSDU.

IEEE80211_HW_REPORTS_LOW_ACK

The driver (or firmware) reports low ack event by ieee80211_report_low_ack based on its own algorithm. For such drivers, mac80211 packet loss mechanism will not be triggered and driver is completely depending on firmware event for station kickout.

IEEE80211_HW_SUPPORTS_TX_FRAG

Hardware does fragmentation by itself. The stack will not do fragmentation. The callback for set_frag_threshold should be set as well.

IEEE80211_HW_SUPPORTS_TDLS_BUFFER_STA

Hardware supports buffer STA on TDLS links.

IEEE80211_HW_DEAUTH_NEED_MGD_TX_PREP

The driver requires the mgd_prepare_tx callback to be called before transmission of a deauthentication frame in case the association was completed but no beacon was heard. This is required in multi-channel scenarios, where the virtual interface might not be given air time for the transmission of the frame, as it is not synced with the AP/P2P GO yet, and thus the deauthentication frame might not be transmitted.

IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP

The driver (or firmware) doesn't support QoS NDP for AP probing - that's most likely a driver bug.

IEEE80211_HW_BUFF_MMPDU_TXQ

use the TXQ for bufferable MMPDUs, this of course requires the driver to use TXQs to start with.

IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW

(Hardware) rate control supports VHT extended NSS BW (dot11VHTExtendedNSSBWCapable). This flag will be set if the selected rate control algorithm sets RATE_CTRL_CAPA_VHT_EXT_NSS_BW but if the rate control is built-in then it must be set by the driver. See also the documentation for that flag.

IEEE80211_HW_STA_MMPDU_TXQ

use the extra non-TID per-station TXQ for all MMPDUs on station interfaces. This of course requires the driver to use TXQs to start with.

IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN

Driver does not report accurate A-MPDU length in tx status information

IEEE80211_HW_SUPPORTS_MULTI_BSSID

Hardware supports multi BSSID

IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID

Hardware supports multi BSSID only for HE APs. Applies if IEEE80211_HW_SUPPORTS_MULTI_BSSID is set.

NUM_IEEE80211_HW_FLAGS

number of hardware flags, used for sizing arrays

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.

AUTHOR

Johannes Berg <johannes@sipsolutions.net>

Author.

COPYRIGHT

June 2023 Kernel Hackers Manual 3.10