/* * HT handling * * Copyright 2003, Jouni Malinen * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc * Copyright 2007, Michael Wu * Copyright 2007-2010, Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /** * DOC: RX A-MPDU aggregation * * Aggregation on the RX side requires only implementing the * @ampdu_action callback that is invoked to start/stop any * block-ack sessions for RX aggregation. * * When RX aggregation is started by the peer, the driver is * notified via @ampdu_action function, with the * %IEEE80211_AMPDU_RX_START action, and may reject the request * in which case a negative response is sent to the peer, if it * accepts it a positive response is sent. * * While the session is active, the device/driver are required * to de-aggregate frames and pass them up one by one to mac80211, * which will handle the reorder buffer. * * When the aggregation session is stopped again by the peer or * ourselves, the driver's @ampdu_action function will be called * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the * call must not fail. */ #ifdef LINUX_OS #include #include #include #include #endif #include "apollo.h" #include "ieee80211_i.h" #include "bh.h" void ieee80211_process_delba(struct atbm_vif *vif, struct sta_info *sta, struct atbm_ieee80211_mgmt *mgmt, size_t len) { u16 tid, params; u16 initiator; params = le16_to_cpu(mgmt->u.action.u.delba.params); tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; if (initiator == WLAN_BACK_INITIATOR) __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, true); } void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) { int i; cancel_work_sync(&sta->ampdu_mlme.work); for (i = 0; i < STA_TID_NUM; i++) { __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_LEAVE_QBSS, tx); } } static void ieee80211_free_tid_rx(struct rcu_head *h) { struct tid_ampdu_rx *tid_rx = container_of(h, struct tid_ampdu_rx, rcu_head); int i; for (i = 0; i < tid_rx->buf_size; i++) atbm_dev_kfree_skb(tid_rx->reorder_buf[i]); atbm_kfree(tid_rx->reorder_buf); atbm_kfree(tid_rx->reorder_time); atbm_kfree(tid_rx); } void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool tx) { struct tid_ampdu_rx *tid_rx; lockdep_assert_held(&sta->ampdu_mlme.mtx); tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], lockdep_is_held(&sta->ampdu_mlme.mtx)); if (!tid_rx) return; RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); atbm_del_timer_sync(&tid_rx->session_timer); atbm_del_timer_sync(&tid_rx->reorder_timer); call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); } void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool tx) { mutex_lock(&sta->ampdu_mlme.mtx); ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); mutex_unlock(&sta->ampdu_mlme.mtx); } /* * After accepting the AddBA Request we activated a timer, * resetting it after each frame that arrives from the originator. */ static void sta_rx_agg_session_timer_expired(unsigned long data) { /* not an elegant detour, but there is no choice as the timer passes * only one argument, and various sta_info are needed here, so init * flow in sta_info_create gives the TID as data, while the timer_to_id * array gives the sta through container_of */ u8 *ptid = (u8 *)data; u8 *timer_to_id = ptid - *ptid; struct sta_info *sta = container_of(timer_to_id, struct sta_info, timer_to_tid[0]); #ifdef CONFIG_MAC80211_ATBM_HT_DEBUG atbm_printk_agg("rx session timer expired on tid %d\n", (u16)*ptid); #endif set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired); atbm_hw_priv_queue_work(sta->hw_priv, &sta->ampdu_mlme.work); } static void sta_rx_agg_reorder_timer_expired(unsigned long data) { u8 *ptid = (u8 *)data; u8 *timer_to_id = ptid - *ptid; struct sta_info *sta = container_of(timer_to_id, struct sta_info, timer_to_tid[0]); rcu_read_lock(); ieee80211_release_reorder_timeout(sta, *ptid); rcu_read_unlock(); } void ieee80211_process_addba_request(struct atbm_common *hw_priv, struct sta_info *sta, struct atbm_ieee80211_mgmt *mgmt, size_t len) { struct tid_ampdu_rx *tid_agg_rx; u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; u8 dialog_token; /* extract session parameters from addba request frame */ dialog_token = mgmt->u.action.u.addba_req.dialog_token; timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); start_seq_num = le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; status = WLAN_STATUS_REQUEST_DECLINED; if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { goto end_no_lock; } /* sanity check for incoming parameters: * check if configuration can support the BA policy * and if buffer size does not exceeds max value */ /* XXX: check own ht delayed BA capability?? */ if (((ba_policy != 1) && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { status = WLAN_STATUS_INVALID_QOS_PARAM; goto end_no_lock; } /* determine default buffer size */ if (buf_size == 0) buf_size = IEEE80211_MAX_AMPDU_BUF; /* examine state machine */ mutex_lock(&sta->ampdu_mlme.mtx); if (sta->ampdu_mlme.tid_rx[tid]) { /* delete existing Rx BA session on the same tid */ ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, WLAN_STATUS_UNSPECIFIED_QOS, false); } /* prepare A-MPDU MLME for Rx aggregation */ tid_agg_rx = atbm_kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL); if (!tid_agg_rx) goto end; spin_lock_init(&tid_agg_rx->reorder_lock); /* rx timer */ tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired; tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; //init_timer(&tid_agg_rx->session_timer); atbm_init_timer(&tid_agg_rx->session_timer); /* rx reorder timer */ tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired; tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid]; //init_timer(&tid_agg_rx->reorder_timer); atbm_init_timer(&tid_agg_rx->reorder_timer); /* prepare reordering buffer */ tid_agg_rx->reorder_buf = atbm_kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL); tid_agg_rx->reorder_time = atbm_kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { atbm_kfree(tid_agg_rx->reorder_buf); atbm_kfree(tid_agg_rx->reorder_time); atbm_kfree(tid_agg_rx); goto end; } /* update data */ tid_agg_rx->dialog_token = dialog_token; tid_agg_rx->ssn = start_seq_num; tid_agg_rx->head_seq_num = start_seq_num; tid_agg_rx->buf_size = buf_size; tid_agg_rx->timeout = timeout; tid_agg_rx->stored_mpdu_num = 0; status = WLAN_STATUS_SUCCESS; /* activate it for RX */ rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); if (timeout) atbm_mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); end: mutex_unlock(&sta->ampdu_mlme.mtx); end_no_lock: return; } void ieee80211_ba_session_work(struct work_struct *work) { struct sta_info *sta = container_of(work, struct sta_info, ampdu_mlme.work); int tid; /* * When this flag is set, new sessions should be * blocked, and existing sessions will be torn * down by the code that set the flag, so this * need not run. */ if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) return; mutex_lock(&sta->ampdu_mlme.mtx); for (tid = 0; tid < STA_TID_NUM; tid++) { if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) ___ieee80211_stop_rx_ba_session( sta, tid, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_TIMEOUT, true); if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_stop_requested)) ___ieee80211_stop_rx_ba_session( sta, tid, WLAN_BACK_RECIPIENT, WLAN_REASON_UNSPECIFIED, true); } mutex_unlock(&sta->ampdu_mlme.mtx); }