Man page 9 : struct_ieee80211_hw

struct_ieee80211_hw - hardware information and state

conf
     struct ieee80211_conf, device configuration, donAqt use.

wiphy
    This points to the struct wiphy allocated for this 802.11 PHY. You must fill in the perm_addr and dev members of this structure using SET_IEEE80211_DEV and SET_IEEE80211_PERM_ADDR. Additionally, all supported bands (with channels, bitrates) are registered here.

rate_control_algorithm
    rate control algorithm for this hardware. If unset (NULL), the default algorithm will be used. Must be set before calling ieee80211_register_hw.

priv
    pointer to private area that was allocated for driver use along with this structure.

flags
    hardware flags, see enum ieee80211_hw_flags.

extra_tx_headroom
    headroom to reserve in each transmit skb for use by the driver (e.g. for transmit headers.)

channel_change_time
    time (in microseconds) it takes to change channels.

vif_data_size
    size (in bytes) of the drv_priv data area within struct ieee80211_vif.

sta_data_size
    size (in bytes) of the drv_priv data area within struct ieee80211_sta.

chanctx_data_size
    size (in bytes) of the drv_priv data area within struct ieee80211_chanctx_conf.

napi_weight
    weight used for NAPI polling. You must specify an appropriate value here if a napi_poll operation is provided by your driver.

queues
    number of available hardware transmit queues for data packets. WMM/QoS requires at least four, these queues need to have configurable access parameters.

max_listen_interval
    max listen interval in units of beacon interval that HW supports

max_signal
    Maximum value for signal (rssi) in RX information, used only when IEEE80211_HW_SIGNAL_UNSPEC or IEEE80211_HW_SIGNAL_DB

max_rates
    maximum number of alternate rate retry stages the hw can handle.

max_report_rates
    maximum number of alternate rate retry stages the hw can report back.

max_rate_tries
    maximum number of tries for each stage

max_rx_aggregation_subframes
    maximum buffer size (number of sub-frames) to be used for A-MPDU block ack receiver aggregation. This is only relevant if the device has restrictions on the number of subframes, if it relies on mac80211 to do reordering it shouldnAqt be set.

max_tx_aggregation_subframes
    maximum number of subframes in an aggregate an HT driver will transmit, used by the peer as a hint to size its reorder buffer.

offchannel_tx_hw_queue
    HW queue ID to use for offchannel TX (if IEEE80211_HW_QUEUE_CONTROL is set)

radiotap_mcs_details
    lists which MCS information can the HW reports, by default it is set to _MCS, _GI and _BW but doesnAqt include _FMT. Use IEEE80211_RADIOTAP_MCS_HAVE_* values, only adding _BW is supported today.

radiotap_vht_details
    lists which VHT MCS information the HW reports, the default is _GI | _BANDWIDTH. Use the IEEE80211_RADIOTAP_VHT_KNOWN_* values.

netdev_features
    netdev features to be set in each netdev created from this HW. Note only HW checksum features are currently compatible with mac80211. Other feature bits will be rejected.

uapsd_queues
    This bitmap is included in (re)association frame to indicate for each access category if it is uAPSD trigger-enabled and delivery- enabled. Use IEEE80211_WMM_IE_STA_QOSINFO_AC_* to set this bitmap. Each bit corresponds to different AC. Value Aq1Aq in specific bit means that corresponding AC is both trigger- and delivery-enabled. Aq0Aq means neither enabled.

uapsd_max_sp_len
    maximum number of total buffered frames the WMM AP may deliver to a WMM STA during any Service Period triggered by the WMM STA. Use IEEE80211_WMM_IE_STA_QOSINFO_SP_* for correct values.

This structure contains the configuration and hardware information for an 802.11 PHY.

Johannes Berg <>
    Author.