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 {
	 int (* tx) (struct ieee80211_hw *hw, struct sk_buff *skb);
	 int (* start) (struct ieee80211_hw *hw);
	 void (* stop) (struct ieee80211_hw *hw);
	 int (* add_interface) (struct ieee80211_hw *hw,struct ieee80211_vif *vif);
	 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);
	 u64 (* prepare_multicast) (struct ieee80211_hw *hw,int mc_count, struct dev_addr_list *mc_list);
	 void (* configure_filter) (struct ieee80211_hw *hw,unsigned int changed_flags,unsigned int *total_flags,u64 multicast);
	 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);
	 int (* hw_scan) (struct ieee80211_hw *hw,struct cfg80211_scan_request *req);
	 void (* sw_scan_start) (struct ieee80211_hw *hw);
	 void (* sw_scan_complete) (struct ieee80211_hw *hw);
	 int (* get_stats) (struct ieee80211_hw *hw,struct ieee80211_low_level_stats *stats);
	 void (* get_tkip_seq) (struct ieee80211_hw *hw, u8 hw_key_idx,u32 *iv32, u16 *iv16);
	 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);
	 void (* sta_notify) (struct ieee80211_hw *hw, struct ieee80211_vif *vif,enum sta_notify_cmd, struct ieee80211_sta *sta);
	 int (* conf_tx) (struct ieee80211_hw *hw, u16 queue,const struct ieee80211_tx_queue_params *params);
	 u64 (* get_tsf) (struct ieee80211_hw *hw);
	 void (* set_tsf) (struct ieee80211_hw *hw, u64 tsf);
	 void (* reset_tsf) (struct ieee80211_hw *hw);
	 int (* tx_last_beacon) (struct ieee80211_hw *hw);
	 int (* ampdu_action) (struct ieee80211_hw *hw,struct ieee80211_vif *vif,enum ieee80211_ampdu_mlme_action action,struct ieee80211_sta *sta, u16 tid, u16 *ssn);
	 void (* rfkill_poll) (struct ieee80211_hw *hw);
	 void (* set_coverage_class) (struct ieee80211_hw *hw, u8 coverage_class);
       #ifdef CONFIG_NL80211_TESTMODE
	 int (* testmode_cmd) (struct ieee80211_hw *hw, void *data, int len);
       #endif
	 void (* flush) (struct ieee80211_hw *hw, bool drop);
       };

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, more importantly, however, it must never fail for A-MPDU-queues. This function should return
	   NETDEV_TX_OK except in very limited cases. Must be implemented and 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.

       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.

       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.

       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.

       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.

       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.

       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
	   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_tkip_seq
	   If your device implements TKIP encryption in hardware this callback should be provided to read the TKIP transmit IVs (both IV32 and
	   IV16) for the given key from hardware. The callback must be atomic.

       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. This callback can sleep.

       sta_notify
	   Notifies low level driver about power state transition of an associated station, AP, IBSS/WDS/mesh peer etc. Must be atomic.

       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. Starting sequence number (ssn) is the first frame we expect to perform the
	   action on. Notice that TX/RX_STOP can pass NULL for this parameter. Returns a negative error code on failure. The callback must be
	   atomic.

       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. This
	   callback is not required and may sleep.

       testmode_cmd
	   Implement a cfg80211 test mode command. The callback can sleep.

       flush
	   Flush all pending frames from the hardware queue, making sure that the hardware queues are empty. If the parameter drop is set to true,
	   pending frames may be dropped. The callback can sleep.

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.

AUTHOR

       Johannes Berg <johannes@sipsolutions.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010						   STRUCT IEEE80211_OPS(9)