void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
{
struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata = sta->sdata;
u16 start_seq_num;
int ret;
lockdep_assert_held(&sta->ampdu_mlme.mtx);
/*
* While we're asking the driver about the aggregation,
* stop the AC queue so that we don't have to worry
* about frames that came in while we were doing that,
* which would require us to put them to the AC pending
* afterwards which just makes the code more complex.
*/
ieee80211_stop_queue_agg(local, tid);
clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
/*
* make sure no packets are being processed to get
* valid starting sequence number
*/
synchronize_net();
start_seq_num = sta->tid_seq[tid] >> 4;
ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
&sta->sta, tid, &start_seq_num);
if (ret) {
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "BA request denied - HW unavailable for"
" tid %d\n", tid);
#endif
spin_lock_bh(&sta->lock);
rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
spin_unlock_bh(&sta->lock);
ieee80211_wake_queue_agg(local, tid);
call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
return;
}
/* we can take packets again now */
ieee80211_wake_queue_agg(local, tid);
/* activate the timer for the recipient's addBA response */
mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
#endif
spin_lock_bh(&sta->lock);
sta->ampdu_mlme.addba_req_num[tid]++;
spin_unlock_bh(&sta->lock);
/* send AddBA request */
ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
tid_tx->dialog_token, start_seq_num,
0x40, 5000);
}
ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
{
ieee80211_wake_queue_agg(local, tid);
}
ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
{
ieee80211_wake_queue_agg(sdata, tid);
}