1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>struct tid_ampdu_tx</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The 802.11 subsystems – for kernel developers"><link rel="up" href="aggregation-internals.html" title="Chapter 23. Aggregation"><link rel="prev" href="API-struct-sta-ampdu-mlme.html" title="struct sta_ampdu_mlme"><link rel="next" href="API-struct-tid-ampdu-rx.html" title="struct tid_ampdu_rx"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct tid_ampdu_tx</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-sta-ampdu-mlme.html">Prev</a> </td><th width="60%" align="center">Chapter 23. Aggregation</th><td width="20%" align="right"> <a accesskey="n" href="API-struct-tid-ampdu-rx.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-tid-ampdu-tx"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct tid_ampdu_tx — 
2  TID aggregation information (Tx).
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting">
4struct tid_ampdu_tx {
5  struct rcu_head rcu_head;
6  struct timer_list session_timer;
7  struct timer_list addba_resp_timer;
8  struct sk_buff_head pending;
9  unsigned long state;
10  unsigned long last_tx;
11  u16 timeout;
12  u8 dialog_token;
13  u8 stop_initiator;
14  bool tx_stop;
15  u8 buf_size;
16  u16 failed_bar_ssn;
17  bool bar_pending;
18  bool amsdu;
19};  </pre></div><div class="refsect1"><a name="id-1.3.6.7.3.5"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">rcu_head</span></dt><dd><p>
20rcu head for freeing structure
21      </p></dd><dt><span class="term">session_timer</span></dt><dd><p>
22check if we keep Tx-ing on the TID (by timeout value)
23      </p></dd><dt><span class="term">addba_resp_timer</span></dt><dd><p>
24timer for peer's response to addba request
25      </p></dd><dt><span class="term">pending</span></dt><dd><p>
26pending frames queue -- use sta's spinlock to protect
27      </p></dd><dt><span class="term">state</span></dt><dd><p>
28session state (see above)
29      </p></dd><dt><span class="term">last_tx</span></dt><dd><p>
30jiffies of last tx activity
31      </p></dd><dt><span class="term">timeout</span></dt><dd><p>
32session timeout value to be filled in ADDBA requests
33      </p></dd><dt><span class="term">dialog_token</span></dt><dd><p>
34dialog token for aggregation session
35      </p></dd><dt><span class="term">stop_initiator</span></dt><dd><p>
36initiator of a session stop
37      </p></dd><dt><span class="term">tx_stop</span></dt><dd><p>
38TX DelBA frame when stopping
39      </p></dd><dt><span class="term">buf_size</span></dt><dd><p>
40reorder buffer size at receiver
41      </p></dd><dt><span class="term">failed_bar_ssn</span></dt><dd><p>
42ssn of the last failed BAR tx attempt
43      </p></dd><dt><span class="term">bar_pending</span></dt><dd><p>
44BAR needs to be re-sent
45      </p></dd><dt><span class="term">amsdu</span></dt><dd><p>
46support A-MSDU withing A-MDPU
47      </p></dd></dl></div></div><div class="refsect1"><a name="id-1.3.6.7.3.6"></a><h2>Description</h2><p>
48   This structure's lifetime is managed by RCU, assignments to
49   the array holding it must hold the aggregation mutex.
50   </p><p>
51
52   The TX path can access it under RCU lock-free if, and
53   only if, the state has the flag <code class="constant">HT_AGG_STATE_OPERATIONAL</code>
54   set. Otherwise, the TX path must also acquire the spinlock
55   and re-check the state, see comments in the tx code
56   touching it.
57</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-sta-ampdu-mlme.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="aggregation-internals.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-struct-tid-ampdu-rx.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct sta_ampdu_mlme</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">struct tid_ampdu_rx</span></td></tr></table></div></body></html>
58