| 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;
struct sta_info * sta;
unsigned long state;
unsigned long last_tx;
u16 timeout;
u8 dialog_token;
u8 stop_initiator;
bool tx_stop;
u16 buf_size;
u16 failed_bar_ssn;
bool bar_pending;
bool amsdu;
u8 tid;
};
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
sta
station we are attached to
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
amsdu
support A-MSDU withing A-MDPU
tid
TID number
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¶
| June 2023 | Kernel Hackers Manual 3.10 |