1STRUCT TID_AMPDU_TX(9)             Internals            STRUCT TID_AMPDU_TX(9)
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NAME

6       struct_tid_ampdu_tx - TID aggregation information (Tx).
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SYNOPSIS

9       struct tid_ampdu_tx {
10         struct rcu_head rcu_head;
11         struct timer_list session_timer;
12         struct timer_list addba_resp_timer;
13         struct sk_buff_head pending;
14         unsigned long state;
15         unsigned long last_tx;
16         u16 timeout;
17         u8 dialog_token;
18         u8 stop_initiator;
19         bool tx_stop;
20         u8 buf_size;
21         u16 failed_bar_ssn;
22         bool bar_pending;
23         bool amsdu;
24       };
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MEMBERS

27       rcu_head
28           rcu head for freeing structure
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30       session_timer
31           check if we keep Tx-ing on the TID (by timeout value)
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33       addba_resp_timer
34           timer for peer's response to addba request
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36       pending
37           pending frames queue -- use sta's spinlock to protect
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39       state
40           session state (see above)
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42       last_tx
43           jiffies of last tx activity
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45       timeout
46           session timeout value to be filled in ADDBA requests
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48       dialog_token
49           dialog token for aggregation session
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51       stop_initiator
52           initiator of a session stop
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54       tx_stop
55           TX DelBA frame when stopping
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57       buf_size
58           reorder buffer size at receiver
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60       failed_bar_ssn
61           ssn of the last failed BAR tx attempt
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63       bar_pending
64           BAR needs to be re-sent
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66       amsdu
67           support A-MSDU withing A-MDPU
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DESCRIPTION

70       This structure's lifetime is managed by RCU, assignments to the array
71       holding it must hold the aggregation mutex.
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73       The TX path can access it under RCU lock-free if, and only if, the
74       state has the flag HT_AGG_STATE_OPERATIONAL set. Otherwise, the TX path
75       must also acquire the spinlock and re-check the state, see comments in
76       the tx code touching it.
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AUTHOR

79       Johannes Berg <johannes@sipsolutions.net>
80           Author.
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83Kernel Hackers Manual 3.10         June 2019            STRUCT TID_AMPDU_TX(9)
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