STRUCT TID_AMPDU_RX(9)                      Internals                      STRUCT TID_AMPDU_RX(9)



NAME
       struct_tid_ampdu_rx - TID aggregation information (Rx).

SYNOPSIS
       struct tid_ampdu_rx {
         struct rcu_head rcu_head;
         spinlock_t reorder_lock;
         u64 reorder_buf_filtered;
         struct sk_buff_head * reorder_buf;
         unsigned long * reorder_time;
         struct timer_list session_timer;
         struct timer_list reorder_timer;
         unsigned long last_rx;
         u16 head_seq_num;
         u16 stored_mpdu_num;
         u16 ssn;
         u16 buf_size;
         u16 timeout;
         u8 dialog_token;
         bool auto_seq;
         bool removed;
       };

MEMBERS
       rcu_head
           RCU head used for freeing this struct

       reorder_lock
           serializes access to reorder buffer, see below.

       reorder_buf_filtered
           bitmap indicating where there are filtered frames in the reorder buffer that should be
           ignored when releasing frames

       reorder_buf
           buffer to reorder incoming aggregated MPDUs. An MPDU may be an A-MSDU with
           individually reported subframes.

       reorder_time
           jiffies when skb was added

       session_timer
           check if peer keeps Tx-ing on the TID (by timeout value)

       reorder_timer
           releases expired frames from the reorder buffer.

       last_rx
           jiffies of last rx activity

       head_seq_num
           head sequence number in reordering buffer.

       stored_mpdu_num
           number of MPDUs in reordering buffer

       ssn
           Starting Sequence Number expected to be aggregated.

       buf_size
           buffer size for incoming A-MPDUs

       timeout
           reset timer value (in TUs).

       dialog_token
           dialog token for aggregation session

       auto_seq
           used for offloaded BA sessions to automatically pick head_seq_and and ssn.

       removed
           this session is removed (but might have been found due to RCU)

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

       The reorder_lock is used to protect the members of this struct, except for timeout,
       buf_size and dialog_token, which are constant across the lifetime of the struct (the
       dialog token being used only for debugging).

AUTHOR
       Johannes Berg <johannes AT sipsolutions.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                    STRUCT TID_AMPDU_RX(9)