1STRUCT TID_AMPDU_RX(9)             Internals            STRUCT TID_AMPDU_RX(9)
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NAME

6       struct_tid_ampdu_rx - TID aggregation information (Rx).
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SYNOPSIS

9       struct tid_ampdu_rx {
10         struct rcu_head rcu_head;
11         spinlock_t reorder_lock;
12         u64 reorder_buf_filtered;
13         struct sk_buff_head * reorder_buf;
14         unsigned long * reorder_time;
15         struct timer_list session_timer;
16         struct timer_list reorder_timer;
17         unsigned long last_rx;
18         u16 head_seq_num;
19         u16 stored_mpdu_num;
20         u16 ssn;
21         u16 buf_size;
22         u16 timeout;
23         u8 auto_seq:1;
24         u8 removed:1;
25         u8 started:1;
26       };
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MEMBERS

29       rcu_head
30           RCU head used for freeing this struct
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32       reorder_lock
33           serializes access to reorder buffer, see below.
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35       reorder_buf_filtered
36           bitmap indicating where there are filtered frames in the reorder
37           buffer that should be ignored when releasing frames
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39       reorder_buf
40           buffer to reorder incoming aggregated MPDUs. An MPDU may be an
41           A-MSDU with individually reported subframes.
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43       reorder_time
44           jiffies when skb was added
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46       session_timer
47           check if peer keeps Tx-ing on the TID (by timeout value)
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49       reorder_timer
50           releases expired frames from the reorder buffer.
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52       last_rx
53           jiffies of last rx activity
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55       head_seq_num
56           head sequence number in reordering buffer.
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58       stored_mpdu_num
59           number of MPDUs in reordering buffer
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61       ssn
62           Starting Sequence Number expected to be aggregated.
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64       buf_size
65           buffer size for incoming A-MPDUs
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67       timeout
68           reset timer value (in TUs).
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70       auto_seq
71           used for offloaded BA sessions to automatically pick head_seq_and
72           and ssn.
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74       removed
75           this session is removed (but might have been found due to RCU)
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77       started
78           this session has started (head ssn or higher was received)
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DESCRIPTION

81       This structure's lifetime is managed by RCU, assignments to the array
82       holding it must hold the aggregation mutex.
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84       The reorder_lock is used to protect the members of this struct, except
85       for timeout, buf_size and dialog_token, which are constant across the
86       lifetime of the struct (the dialog token being used only for
87       debugging).
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AUTHOR

90       Johannes Berg <johannes@sipsolutions.net>
91           Author.
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94Kernel Hackers Manual 3.10         June 2019            STRUCT TID_AMPDU_RX(9)
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