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struct_ieee80211_ops(9) - phpMan
STRUCT IEEE80211_OPS(9) The basic mac80211 driver inte STRUCT IEEE80211_OPS(9)
NAME
struct_ieee80211_ops - callbacks from mac80211 to the driver
SYNOPSIS
struct ieee80211_ops {
void (* tx) (struct ieee80211_hw *hw,struct ieee80211_tx_control *control,struct sk_buff *skb);
int (* start) (struct ieee80211_hw *hw);
void (* stop) (struct ieee80211_hw *hw);
#ifdef CONFIG_PM
int (* suspend) (struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan);
int (* resume) (struct ieee80211_hw *hw);
void (* set_wakeup) (struct ieee80211_hw *hw, bool enabled);
#endif
int (* add_interface) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* change_interface) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,enum nl80211_iftype new_type, bool p2p);
void (* remove_interface) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* config) (struct ieee80211_hw *hw, u32 changed);
void (* bss_info_changed) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_bss_conf *info,u32 changed);
int (* start_ap) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void (* stop_ap) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
u64 (* prepare_multicast) (struct ieee80211_hw *hw,struct netdev_hw_addr_list *mc_list);
void (* configure_filter) (struct ieee80211_hw *hw,unsigned int changed_flags,unsigned int *total_flags,u64 multicast);
void (* config_iface_filter) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,unsigned int filter_flags,unsigned int changed_flags);
int (* set_tim) (struct ieee80211_hw *hw, struct ieee80211_sta *sta,bool set);
int (* set_key) (struct ieee80211_hw *hw, enum set_key_cmd cmd,struct ieee80211_vif *vif, struct ieee80211_sta *sta,struct ieee80211_key_conf *key);
void (* update_tkip_key) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_key_conf *conf,struct ieee80211_sta *sta,u32 iv32, u16 *phase1key);
void (* set_rekey_data) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct cfg80211_gtk_rekey_data *data);
void (* set_default_unicast_key) (struct ieee80211_hw *hw,struct ieee80211_vif *vif, int idx);
int (* hw_scan) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,struct ieee80211_scan_request *req);
void (* cancel_hw_scan) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* sched_scan_start) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct cfg80211_sched_scan_request *req,struct ieee80211_scan_ies *ies);
int (* sched_scan_stop) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
void (* sw_scan_start) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,const u8 *mac_addr);
void (* sw_scan_complete) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* get_stats) (struct ieee80211_hw *hw,struct ieee80211_low_level_stats *stats);
void (* get_key_seq) (struct ieee80211_hw *hw,struct ieee80211_key_conf *key,struct ieee80211_key_seq *seq);
int (* set_frag_threshold) (struct ieee80211_hw *hw, u32 value);
int (* set_rts_threshold) (struct ieee80211_hw *hw, u32 value);
int (* sta_add) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,struct ieee80211_sta *sta);
int (* sta_remove) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,struct ieee80211_sta *sta);
#ifdef CONFIG_MAC80211_DEBUGFS
void (* sta_add_debugfs) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta,struct dentry *dir);
void (* sta_remove_debugfs) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta,struct dentry *dir);
#endif
void (* sta_notify) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,enum sta_notify_cmd, struct ieee80211_sta *sta);
int (* sta_state) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,struct ieee80211_sta *sta,enum ieee80211_sta_state old_state,enum ieee80211_sta_state new_state);
void (* sta_pre_rcu_remove) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta);
void (* sta_rc_update) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta,u32 changed);
void (* sta_rate_tbl_update) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta);
void (* sta_statistics) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta,struct station_info *sinfo);
int (* conf_tx) (struct ieee80211_hw *hw,struct ieee80211_vif *vif, u16 ac,const struct ieee80211_tx_queue_params *params);
u64 (* get_tsf) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void (* set_tsf) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,u64 tsf);
void (* reset_tsf) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
int (* tx_last_beacon) (struct ieee80211_hw *hw);
int (* ampdu_action) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_ampdu_params *params);
int (* get_survey) (struct ieee80211_hw *hw, int idx,struct survey_info *survey);
void (* rfkill_poll) (struct ieee80211_hw *hw);
void (* set_coverage_class) (struct ieee80211_hw *hw, s16 coverage_class);
#ifdef CONFIG_NL80211_TESTMODE
int (* testmode_cmd) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,void *data, int len);
int (* testmode_dump) (struct ieee80211_hw *hw, struct sk_buff *skb,struct netlink_callback *cb,void *data, int len);
#endif
void (* flush) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,u32 queues, bool drop);
void (* channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_channel_switch *ch_switch);
int (* set_antenna) (struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant);
int (* get_antenna) (struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant);
int (* remain_on_channel) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_channel *chan,int duration,enum ieee80211_roc_type type);
int (* cancel_remain_on_channel) (struct ieee80211_hw *hw);
int (* set_ringparam) (struct ieee80211_hw *hw, u32 tx, u32 rx);
void (* get_ringparam) (struct ieee80211_hw *hw,u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max);
bool (* tx_frames_pending) (struct ieee80211_hw *hw);
int (* set_bitrate_mask) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,const struct cfg80211_bitrate_mask *mask);
void (* event_callback) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,const struct ieee80211_event *event);
void (* allow_buffered_frames) (struct ieee80211_hw *hw,struct ieee80211_sta *sta,u16 tids, int num_frames,enum ieee80211_frame_release_type reason,bool more_data);
void (* release_buffered_frames) (struct ieee80211_hw *hw,struct ieee80211_sta *sta,u16 tids, int num_frames,enum ieee80211_frame_release_type reason,bool more_data);
int (* get_et_sset_count) (struct ieee80211_hw *hw,struct ieee80211_vif *vif, int sset);
void (* get_et_stats) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ethtool_stats *stats, u64 *data);
void (* get_et_strings) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,u32 sset, u8 *data);
void (* mgd_prepare_tx) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
void (* mgd_protect_tdls_discover) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* add_chanctx) (struct ieee80211_hw *hw,struct ieee80211_chanctx_conf *ctx);
void (* remove_chanctx) (struct ieee80211_hw *hw,struct ieee80211_chanctx_conf *ctx);
void (* change_chanctx) (struct ieee80211_hw *hw,struct ieee80211_chanctx_conf *ctx,u32 changed);
int (* assign_vif_chanctx) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_chanctx_conf *ctx);
void (* unassign_vif_chanctx) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_chanctx_conf *ctx);
int (* switch_vif_chanctx) (struct ieee80211_hw *hw,struct ieee80211_vif_chanctx_switch *vifs,int n_vifs,enum ieee80211_chanctx_switch_mode mode);
void (* reconfig_complete) (struct ieee80211_hw *hw,enum ieee80211_reconfig_type reconfig_type);
#if IS_ENABLED(CONFIG_IPV6)
void (* ipv6_addr_change) (struct ieee80211_hw *hw,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);
int (* pre_channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_channel_switch *ch_switch);
int (* post_channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
int (* join_ibss) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void (* leave_ibss) (struct ieee80211_hw *hw, struct ieee80211_vif *vif);
u32 (* get_expected_throughput) (struct ieee80211_hw *hw,struct ieee80211_sta *sta);
int (* get_txpower) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,int *dbm);
int (* tdls_channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta, u8 oper_class,struct cfg80211_chan_def *chandef,struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie);
void (* tdls_cancel_channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_sta *sta);
void (* tdls_recv_channel_switch) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,struct ieee80211_tdls_ch_sw_params *params);
void (* wake_tx_queue) (struct ieee80211_hw *hw,struct ieee80211_txq *txq);
void (* sync_rx_queues) (struct ieee80211_hw *hw);
};
MEMBERS
tx
Handler that 802.11 module calls for each transmitted frame. skb contains the buffer
starting from the IEEE 802.11 header. The low-level driver should send the frame out
based on configuration in the TX control data. This handler should, preferably, never
fail and stop queues appropriately. Must be atomic.
start
Called before the first netdevice attached to the hardware is enabled. This should
turn on the hardware and must turn on frame reception (for possibly enabled monitor
interfaces.) Returns negative error codes, these may be seen in userspace, or zero.
When the device is started it should not have a MAC address to avoid acknowledging
frames before a non-monitor device is added. Must be implemented and can sleep.
stop
Called after last netdevice attached to the hardware is disabled. This should turn off
the hardware (at least it must turn off frame reception.) May be called right after
add_interface if that rejects an interface. If you added any work onto the mac80211
workqueue you should ensure to cancel it on this callback. Must be implemented and can
sleep.
suspend
Suspend the device; mac80211 itself will quiesce before and stop transmitting and
doing any other configuration, and then ask the device to suspend. This is only
invoked when WoWLAN is configured, otherwise the device is deconfigured completely and
reconfigured at resume time. The driver may also impose special conditions under which
it wants to use the “normal” suspend (deconfigure), say if it only supports WoWLAN
when the device is associated. In this case, it must return 1 from this function.
resume
If WoWLAN was configured, this indicates that mac80211 is now resuming its operation,
after this the device must be fully functional again. If this returns an error, the
only way out is to also unregister the device. If it returns 1, then mac80211 will
also go through the regular complete restart on resume.
set_wakeup
Enable or disable wakeup when WoWLAN configuration is modified. The reason is that
device_set_wakeup_enable is supposed to be called when the configuration changes, not
only in suspend.
add_interface
Called when a netdevice attached to the hardware is enabled. Because it is not called
for monitor mode devices, start and stop must be implemented. The driver should
perform any initialization it needs before the device can be enabled. The initial
configuration for the interface is given in the conf parameter. The callback may
refuse to add an interface by returning a negative error code (which will be seen in
userspace.) Must be implemented and can sleep.
change_interface
Called when a netdevice changes type. This callback is optional, but only if it is
supported can interface types be switched while the interface is UP. The callback may
sleep. Note that while an interface is being switched, it will not be found by the
interface iteration callbacks.
remove_interface
Notifies a driver that an interface is going down. The stop callback is called after
this if it is the last interface and no monitor interfaces are present. When all
interfaces are removed, the MAC address in the hardware must be cleared so the device
no longer acknowledges packets, the mac_addr member of the conf structure is, however,
set to the MAC address of the device going away. Hence, this callback must be
implemented. It can sleep.
config
Handler for configuration requests. IEEE 802.11 code calls this function to change
hardware configuration, e.g., channel. This function should never fail but returns a
negative error code if it does. The callback can sleep.
bss_info_changed
Handler for configuration requests related to BSS parameters that may vary during
BSS's lifespan, and may affect low level driver (e.g. assoc/disassoc status, erp
parameters). This function should not be used if no BSS has been set, unless for
association indication. The changed parameter indicates which of the bss parameters
has changed when a call is made. The callback can sleep.
start_ap
Start operation on the AP interface, this is called after all the information in
bss_conf is set and beacon can be retrieved. A channel context is bound before this is
called. Note that if the driver uses software scan or ROC, this (and stop_ap) isn't
called when the AP is just “paused” for scanning/ROC, which is indicated by the beacon
being disabled/enabled via bss_info_changed.
stop_ap
Stop operation on the AP interface.
prepare_multicast
Prepare for multicast filter configuration. This callback is optional, and its return
value is passed to configure_filter. This callback must be atomic.
configure_filter
Configure the device's RX filter. See the section “Frame filtering” for more
information. This callback must be implemented and can sleep.
config_iface_filter
Configure the interface's RX filter. This callback is optional and is used to
configure which frames should be passed to mac80211. The filter_flags is the
combination of FIF_* flags. The changed_flags is a bit mask that indicates which flags
are changed. This callback can sleep.
set_tim
Set TIM bit. mac80211 calls this function when a TIM bit must be set or cleared for a
given STA. Must be atomic.
set_key
See the section “Hardware crypto acceleration” This callback is only called between
add_interface and remove_interface calls, i.e. while the given virtual interface is
enabled. Returns a negative error code if the key can't be added. The callback can
sleep.
update_tkip_key
See the section “Hardware crypto acceleration” This callback will be called in the
context of Rx. Called for drivers which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY. The
callback must be atomic.
set_rekey_data
If the device supports GTK rekeying, for example while the host is suspended, it can
assign this callback to retrieve the data necessary to do GTK rekeying, this is the
KEK, KCK and replay counter. After rekeying was done it should (for example during
resume) notify userspace of the new replay counter using ieee80211_gtk_rekey_notify.
set_default_unicast_key
Set the default (unicast) key index, useful for WEP when the device sends data packets
autonomously, e.g. for ARP offloading. The index can be 0-3, or -1 for unsetting it.
hw_scan
Ask the hardware to service the scan request, no need to start the scan state machine
in stack. The scan must honour the channel configuration done by the regulatory agent
in the wiphy's registered bands. The hardware (or the driver) needs to make sure that
power save is disabled. The req ie/ie_len members are rewritten by mac80211 to contain
the entire IEs after the SSID, so that drivers need not look at these at all but just
send them after the SSID -- mac80211 includes the (extended) supported rates and HT
information (where applicable). When the scan finishes, ieee80211_scan_completed must
be called; note that it also must be called when the scan cannot finish due to any
error unless this callback returned a negative error code. The callback can sleep.
cancel_hw_scan
Ask the low-level tp cancel the active hw scan. The driver should ask the hardware to
cancel the scan (if possible), but the scan will be completed only after the driver
will call ieee80211_scan_completed. This callback is needed for wowlan, to prevent
enqueueing a new scan_work after the low-level driver was already suspended. The
callback can sleep.
sched_scan_start
Ask the hardware to start scanning repeatedly at specific intervals. The driver must
call the ieee80211_sched_scan_results function whenever it finds results. This process
will continue until sched_scan_stop is called.
sched_scan_stop
Tell the hardware to stop an ongoing scheduled scan. In this case,
ieee80211_sched_scan_stopped must not be called.
sw_scan_start
Notifier function that is called just before a software scan is started. Can be NULL,
if the driver doesn't need this notification. The mac_addr parameter allows supporting
NL80211_SCAN_FLAG_RANDOM_ADDR, the driver may set the
NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR flag if it can use this parameter. The callback
can sleep.
sw_scan_complete
Notifier function that is called just after a software scan finished. Can be NULL, if
the driver doesn't need this notification. The callback can sleep.
get_stats
Return low-level statistics. Returns zero if statistics are available. The callback
can sleep.
get_key_seq
If your device implements encryption in hardware and does IV/PN assignment then this
callback should be provided to read the IV/PN for the given key from hardware. The
callback must be atomic.
set_frag_threshold
Configuration of fragmentation threshold. Assign this if the device does fragmentation
by itself; if this callback is implemented then the stack will not do fragmentation.
The callback can sleep.
set_rts_threshold
Configuration of RTS threshold (if device needs it) The callback can sleep.
sta_add
Notifies low level driver about addition of an associated station, AP, IBSS/WDS/mesh
peer etc. This callback can sleep.
sta_remove
Notifies low level driver about removal of an associated station, AP, IBSS/WDS/mesh
peer etc. Note that after the callback returns it isn't safe to use the pointer, not
even RCU protected; no RCU grace period is guaranteed between returning here and
freeing the station. See sta_pre_rcu_remove if needed. This callback can sleep.
sta_add_debugfs
Drivers can use this callback to add debugfs files when a station is added to
mac80211's station list. This callback and sta_remove_debugfs should be within a
CONFIG_MAC80211_DEBUGFS conditional. This callback can sleep.
sta_remove_debugfs
Remove the debugfs files which were added using sta_add_debugfs. This callback can
sleep.
sta_notify
Notifies low level driver about power state transition of an associated station, AP,
IBSS/WDS/mesh peer etc. For a VIF operating in AP mode, this callback will not be
called when the flag IEEE80211_HW_AP_LINK_PS is set. Must be atomic.
sta_state
Notifies low level driver about state transition of a station (which can be the AP, a
client, IBSS/WDS/mesh peer etc.) This callback is mutually exclusive with
sta_add/sta_remove. It must not fail for down transitions but may fail for transitions
up the list of states. Also note that after the callback returns it isn't safe to use
the pointer, not even RCU protected - no RCU grace period is guaranteed between
returning here and freeing the station. See sta_pre_rcu_remove if needed. The callback
can sleep.
sta_pre_rcu_remove
Notify driver about station removal before RCU synchronisation. This is useful if a
driver needs to have station pointers protected using RCU, it can then use this call
to clear the pointers instead of waiting for an RCU grace period to elapse in
sta_state. The callback can sleep.
sta_rc_update
Notifies the driver of changes to the bitrates that can be used to transmit to the
station. The changes are advertised with bits from enum ieee80211_rate_control_changed
and the values are reflected in the station data. This callback should only be used
when the driver uses hardware rate control (IEEE80211_HW_HAS_RATE_CONTROL) since
otherwise the rate control algorithm is notified directly. Must be atomic.
sta_rate_tbl_update
Notifies the driver that the rate table changed. This is only used if the configured
rate control algorithm actually uses the new rate table API, and is therefore
optional. Must be atomic.
sta_statistics
Get statistics for this station. For example with beacon filtering, the statistics
kept by mac80211 might not be accurate, so let the driver pre-fill the statistics. The
driver can fill most of the values (indicating which by setting the filled bitmap),
but not all of them make sense - see the source for which ones are possible.
Statistics that the driver doesn't fill will be filled by mac80211. The callback can
sleep.
conf_tx
Configure TX queue parameters (EDCF (aifs, cw_min, cw_max), bursting) for a hardware
TX queue. Returns a negative error code on failure. The callback can sleep.
get_tsf
Get the current TSF timer value from firmware/hardware. Currently, this is only used
for IBSS mode BSSID merging and debugging. Is not a required function. The callback
can sleep.
set_tsf
Set the TSF timer to the specified value in the firmware/hardware. Currently, this is
only used for IBSS mode debugging. Is not a required function. The callback can sleep.
reset_tsf
Reset the TSF timer and allow firmware/hardware to synchronize with other STAs in the
IBSS. This is only used in IBSS mode. This function is optional if the
firmware/hardware takes full care of TSF synchronization. The callback can sleep.
tx_last_beacon
Determine whether the last IBSS beacon was sent by us. This is needed only for IBSS
mode and the result of this function is used to determine whether to reply to Probe
Requests. Returns non-zero if this device sent the last beacon. The callback can
sleep.
ampdu_action
Perform a certain A-MPDU action The RA/TID combination determines the destination and
TID we want the ampdu action to be performed for. The action is defined through
ieee80211_ampdu_mlme_action. When the action is set to IEEE80211_AMPDU_TX_OPERATIONAL
the driver may neither send aggregates containing more subframes than buf_size nor
send aggregates in a way that lost frames would exceed the buffer size. If just
limiting the aggregate size, this would be possible with a buf_size of 8: - TX:
1.....7 - RX: 2....7 (lost frame #1) - TX: 8..1... which is invalid since #1 was now
re-transmitted well past the buffer size of 8. Correct ways to retransmit #1 would be:
- TX: 1 or 18 or 81 Even “189” would be wrong since 1 could be lost again.
get_survey
Return per-channel survey information
rfkill_poll
Poll rfkill hardware state. If you need this, you also need to set wiphy->rfkill_poll
to true before registration, and need to call wiphy_rfkill_set_hw_state in the
callback. The callback can sleep.
set_coverage_class
Set slot time for given coverage class as specified in IEEE 802.11-2007 section
17.3.8.6 and modify ACK timeout accordingly; coverage class equals to -1 to enable ACK
timeout estimation algorithm (dynack). To disable dynack set valid value for coverage
class. This callback is not required and may sleep.
testmode_cmd
Implement a cfg80211 test mode command. The passed vif may be NULL. The callback can
sleep.
testmode_dump
Implement a cfg80211 test mode dump. The callback can sleep.
flush
Flush all pending frames from the hardware queue, making sure that the hardware queues
are empty. The queues parameter is a bitmap of queues to flush, which is useful if
different virtual interfaces use different hardware queues; it may also indicate all
queues. If the parameter drop is set to true, pending frames may be dropped. Note that
vif can be NULL. The callback can sleep.
channel_switch
Drivers that need (or want) to offload the channel switch operation for CSAs received
from the AP may implement this callback. They must then call ieee80211_chswitch_done
to indicate completion of the channel switch.
set_antenna
Set antenna configuration (tx_ant, rx_ant) on the device. Parameters are bitmaps of
allowed antennas to use for TX/RX. Drivers may reject TX/RX mask combinations they
cannot support by returning -EINVAL (also see nl80211.h
NL80211_ATTR_WIPHY_ANTENNA_TX).
get_antenna
Get current antenna configuration from device (tx_ant, rx_ant).
remain_on_channel
Starts an off-channel period on the given channel, must call back to
ieee80211_ready_on_channel when on that channel. Note that normal channel traffic is
not stopped as this is intended for hw offload. Frames to transmit on the off-channel
channel are transmitted normally except for the IEEE80211_TX_CTL_TX_OFFCHAN flag. When
the duration (which will always be non-zero) expires, the driver must call
ieee80211_remain_on_channel_expired. Note that this callback may be called while the
device is in IDLE and must be accepted in this case. This callback may sleep.
cancel_remain_on_channel
Requests that an ongoing off-channel period is aborted before it expires. This
callback may sleep.
set_ringparam
Set tx and rx ring sizes.
get_ringparam
Get tx and rx ring current and maximum sizes.
tx_frames_pending
Check if there is any pending frame in the hardware queues before entering power save.
set_bitrate_mask
Set a mask of rates to be used for rate control selection when transmitting a frame.
Currently only legacy rates are handled. The callback can sleep.
event_callback
Notify driver about any event in mac80211. See enum ieee80211_event_type for the
different types. The callback must be atomic.
allow_buffered_frames
Prepare device to allow the given number of frames to go out to the given station. The
frames will be sent by mac80211 via the usual TX path after this call. The TX
information for frames released will also have the IEEE80211_TX_CTL_NO_PS_BUFFER flag
set and the last one will also have IEEE80211_TX_STATUS_EOSP set. In case frames from
multiple TIDs are released and the driver might reorder them between the TIDs, it must
set the IEEE80211_TX_STATUS_EOSP flag on the last frame and clear it on all others and
also handle the EOSP bit in the QoS header correctly. Alternatively, it can also call
the ieee80211_sta_eosp function. The tids parameter is a bitmap and tells the driver
which TIDs the frames will be on; it will at most have two bits set. This callback
must be atomic.
release_buffered_frames
Release buffered frames according to the given parameters. In the case where the
driver buffers some frames for sleeping stations mac80211 will use this callback to
tell the driver to release some frames, either for PS-poll or uAPSD. Note that if the
more_data parameter is false the driver must check if there are more frames on the
given TIDs, and if there are more than the frames being released then it must still
set the more-data bit in the frame. If the more_data parameter is true, then of course
the more-data bit must always be set. The tids parameter tells the driver which TIDs
to release frames from, for PS-poll it will always have only a single bit set. In the
case this is used for a PS-poll initiated release, the num_frames parameter will
always be 1 so code can be shared. In this case the driver must also set
IEEE80211_TX_STATUS_EOSP flag on the TX status (and must report TX status) so that the
PS-poll period is properly ended. This is used to avoid sending multiple responses for
a retried PS-poll frame. In the case this is used for uAPSD, the num_frames parameter
may be bigger than one, but the driver may send fewer frames (it must send at least
one, however). In this case it is also responsible for setting the EOSP flag in the
QoS header of the frames. Also, when the service period ends, the driver must set
IEEE80211_TX_STATUS_EOSP on the last frame in the SP. Alternatively, it may call the
function ieee80211_sta_eosp to inform mac80211 of the end of the SP. This callback
must be atomic.
get_et_sset_count
Ethtool API to get string-set count.
get_et_stats
Ethtool API to get a set of u64 stats.
get_et_strings
Ethtool API to get a set of strings to describe stats and perhaps other supported
types of ethtool data-sets.
mgd_prepare_tx
Prepare for transmitting a management frame for association before associated. In
multi-channel scenarios, a virtual interface is bound to a channel before it is
associated, but as it isn't associated yet it need not necessarily be given airtime,
in particular since any transmission to a P2P GO needs to be synchronized against the
GO's powersave state. mac80211 will call this function before transmitting a
management frame prior to having successfully associated to allow the driver to give
it channel time for the transmission, to get a response and to be able to synchronize
with the GO. The callback will be called before each transmission and upon return
mac80211 will transmit the frame right away. The callback is optional and can
(should!) sleep.
mgd_protect_tdls_discover
Protect a TDLS discovery session. After sending a TDLS discovery-request, we expect a
reply to arrive on the AP's channel. We must stay on the channel (no PSM, scan, etc.),
since a TDLS setup-response is a direct packet not buffered by the AP. mac80211 will
call this function just before the transmission of a TDLS discovery-request. The
recommended period of protection is at least 2 * (DTIM period). The callback is
optional and can sleep.
add_chanctx
Notifies device driver about new channel context creation. This callback may sleep.
remove_chanctx
Notifies device driver about channel context destruction. This callback may sleep.
change_chanctx
Notifies device driver about channel context changes that may happen when combining
different virtual interfaces on the same channel context with different settings This
callback may sleep.
assign_vif_chanctx
Notifies device driver about channel context being bound to vif. Possible use is for
hw queue remapping. This callback may sleep.
unassign_vif_chanctx
Notifies device driver about channel context being unbound from vif. This callback may
sleep.
switch_vif_chanctx
switch a number of vifs from one chanctx to another, as specified in the list of
ieee80211_vif_chanctx_switch passed to the driver, according to the mode defined in
ieee80211_chanctx_switch_mode. This callback may sleep.
reconfig_complete
Called after a call to ieee80211_restart_hw and during resume, when the
reconfiguration has completed. This can help the driver implement the reconfiguration
step (and indicate mac80211 is ready to receive frames). This callback may sleep.
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 1 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 1 using ieee80211_csa_is_complete after the beacon has been transmitted
and then call ieee80211_csa_finish. If the CSA count starts as zero or 1, this
function will not be called, since there won't be any time to beacon before the switch
anyway.
pre_channel_switch
This is an optional callback that is called before a channel switch procedure is
started (ie. when a STA gets a CSA or an userspace initiated channel-switch), allowing
the driver to prepare for the channel switch.
post_channel_switch
This is an optional callback that is called after a channel switch procedure is
completed, allowing the driver to go back to a normal configuration.
join_ibss
Join an IBSS (on an IBSS interface); this is called after all information in bss_conf
is set up and the beacon can be retrieved. A channel context is bound before this is
called.
leave_ibss
Leave the IBSS again.
get_expected_throughput
extract the expected throughput towards the specified station. The returned value is
expressed in Kbps. It returns 0 if the RC algorithm does not have proper data to
provide.
get_txpower
get current maximum tx power (in dBm) based on configuration and hardware limits.
tdls_channel_switch
Start channel-switching with a TDLS peer. The driver is responsible for continually
initiating channel-switching operations and returning to the base channel for
communication with the AP. The driver receives a channel-switch request template and
the location of the switch-timing IE within the template as part of the invocation.
The template is valid only within the call, and the driver can optionally copy the skb
for further re-use.
tdls_cancel_channel_switch
Stop channel-switching with a TDLS peer. Both peers must be on the base channel when
the call completes.
tdls_recv_channel_switch
a TDLS channel-switch related frame (request or response) has been received from a
remote peer. The driver gets parameters parsed from the incoming frame and may use
them to continue an ongoing channel-switch operation. In addition, a channel-switch
response template is provided, together with the location of the switch-timing IE
within the template. The skb can only be used within the function call.
wake_tx_queue
Called when new packets have been added to the queue.
sync_rx_queues
Process all pending frames in RSS queues. This is a synchronization which is needed in
case driver has in its RSS queues pending frames that were received prior to the
control path action currently taken (e.g. disassociation) but are not processed yet.
DESCRIPTION
This structure contains various callbacks that the driver may handle or, in some cases,
must handle, for example to configure the hardware to a new channel or to transmit a
frame.
Returns a negative error code on failure. The callback can sleep.
AUTHOR
Johannes Berg <johannes AT sipsolutions.net>
Author.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 STRUCT IEEE80211_OPS(9)
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