STRUCT 
TID_AMPDU_TX(9)						     Internals						    STRUCT TID_AMPDU_TX(9)

NAME

       struct_tid_ampdu_tx - TID aggregation information (Tx).

SYNOPSIS

       struct tid_ampdu_tx {
	 struct rcu_head rcu_head;
	 struct timer_list session_timer;
	 struct timer_list addba_resp_timer;
	 struct sk_buff_head pending;
	 unsigned long state;
	 unsigned long last_tx;
	 u16 timeout;
	 u8 dialog_token;
	 u8 stop_initiator;
	 bool tx_stop;
	 u8 buf_size;
	 u16 failed_bar_ssn;
	 bool bar_pending;
       };

MEMBERS

       rcu_head
	   rcu head for freeing structure

       session_timer
	   check if we keep Tx-ing on the TID (by timeout value)

       addba_resp_timer
	   timer for peer's response to addba request

       pending
	   pending frames queue -- use sta's spinlock to protect

       state
	   session state (see above)

       last_tx
	   jiffies of last tx activity

       timeout
	   session timeout value to be filled in ADDBA requests

       dialog_token
	   dialog token for aggregation session

       stop_initiator
	   initiator of a session stop

       tx_stop
	   TX DelBA frame when stopping

       buf_size
	   reorder buffer size at receiver

       failed_bar_ssn
	   ssn of the last failed BAR tx attempt

       bar_pending
	   BAR needs to be re-sent

DESCRIPTION

       This structure's lifetime is managed by RCU, assignments to the array holding it must hold the aggregation mutex.

       The TX path can access it under RCU lock-free if, and only if, the state has the flag HT_AGG_STATE_OPERATIONAL set. Otherwise, the TX path
       must also acquire the spinlock and re-check the state, see comments in the tx code touching it.

AUTHOR

       Johannes Berg <johannes@sipsolutions.net>
	   Author.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						    STRUCT TID_AMPDU_TX(9)