| /* |
| * HT handling |
| * |
| * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007, Michael Wu <flamingice@sourmilk.net> |
| * 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. |
| */ |
| |
| #include <linux/ieee80211.h> |
| #include <linux/slab.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "wme.h" |
| |
| /** |
| * DOC: TX A-MPDU aggregation |
| * |
| * Aggregation on the TX side requires setting the hardware flag |
| * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
| * packets with a flag indicating A-MPDU aggregation. The driver |
| * or device is responsible for actually aggregating the frames, |
| * as well as deciding how many and which to aggregate. |
| * |
| * When TX aggregation is started by some subsystem (usually the rate |
| * control algorithm would be appropriate) by calling the |
| * ieee80211_start_tx_ba_session() function, the driver will be |
| * notified via its @ampdu_action function, with the |
| * %IEEE80211_AMPDU_TX_START action. |
| * |
| * In response to that, the driver is later required to call the |
| * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
| * start the aggregation session after the peer has also responded. |
| * If the peer responds negatively, the session will be stopped |
| * again right away. Note that it is possible for the aggregation |
| * session to be stopped before the driver has indicated that it |
| * is done setting it up, in which case it must not indicate the |
| * setup completion. |
| * |
| * Also note that, since we also need to wait for a response from |
| * the peer, the driver is notified of the completion of the |
| * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the |
| * @ampdu_action callback. |
| * |
| * Similarly, when the aggregation session is stopped by the peer |
| * or something calling ieee80211_stop_tx_ba_session(), the driver's |
| * @ampdu_action function will be called with the action |
| * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, |
| * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). |
| */ |
| |
| static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
| const u8 *da, u16 tid, |
| u8 dialog_token, u16 start_seq_num, |
| u16 agg_size, u16 timeout) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| struct ieee80211_mgmt *mgmt; |
| u16 capab; |
| |
| skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| memset(mgmt, 0, 24); |
| memcpy(mgmt->da, da, ETH_ALEN); |
| memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
| if (sdata->vif.type == NL80211_IFTYPE_AP || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
| else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| |
| mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| IEEE80211_STYPE_ACTION); |
| |
| skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req)); |
| |
| mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
| |
| mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
| capab = (u16)(1 << 1); /* bit 1 aggregation policy */ |
| capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ |
| |
| mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
| |
| mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
| mgmt->u.action.u.addba_req.start_seq_num = |
| cpu_to_le16(start_seq_num << 4); |
| |
| ieee80211_tx_skb(sdata, skb); |
| } |
| |
| void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| struct ieee80211_bar *bar; |
| u16 bar_control = 0; |
| |
| skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); |
| memset(bar, 0, sizeof(*bar)); |
| bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
| IEEE80211_STYPE_BACK_REQ); |
| memcpy(bar->ra, ra, ETH_ALEN); |
| memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
| bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
| bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
| bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
| bar->control = cpu_to_le16(bar_control); |
| bar->start_seq_num = cpu_to_le16(ssn); |
| |
| IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; |
| ieee80211_tx_skb(sdata, skb); |
| } |
| |
| void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
| struct tid_ampdu_tx *tid_tx) |
| { |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| lockdep_assert_held(&sta->lock); |
| rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
| } |
| |
| int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| enum ieee80211_back_parties initiator, |
| bool tx) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct tid_ampdu_tx *tid_tx; |
| int ret; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| spin_lock_bh(&sta->lock); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| if (!tid_tx) { |
| spin_unlock_bh(&sta->lock); |
| return -ENOENT; |
| } |
| |
| if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
| /* not even started yet! */ |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| spin_unlock_bh(&sta->lock); |
| kfree_rcu(tid_tx, rcu_head); |
| return 0; |
| } |
| |
| spin_unlock_bh(&sta->lock); |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n", |
| sta->sta.addr, tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
| |
| del_timer_sync(&tid_tx->addba_resp_timer); |
| |
| /* |
| * After this packets are no longer handed right through |
| * to the driver but are put onto tid_tx->pending instead, |
| * with locking to ensure proper access. |
| */ |
| clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| |
| tid_tx->stop_initiator = initiator; |
| tid_tx->tx_stop = tx; |
| |
| ret = drv_ampdu_action(local, sta->sdata, |
| IEEE80211_AMPDU_TX_STOP, |
| &sta->sta, tid, NULL, 0); |
| |
| /* HW shall not deny going back to legacy */ |
| if (WARN_ON(ret)) { |
| /* |
| * We may have pending packets get stuck in this case... |
| * Not bothering with a workaround for now. |
| */ |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * After sending add Block Ack request we activated a timer until |
| * add Block Ack response will arrive from the recipient. |
| * If this timer expires sta_addba_resp_timer_expired will be executed. |
| */ |
| static void sta_addba_resp_timer_expired(unsigned long data) |
| { |
| /* not an elegant detour, but there is no choice as the timer passes |
| * only one argument, and both sta_info and TID are needed, so init |
| * flow in sta_info_create gives the TID as data, while the timer_to_id |
| * array gives the sta through container_of */ |
| u16 tid = *(u8 *)data; |
| struct sta_info *sta = container_of((void *)data, |
| struct sta_info, timer_to_tid[tid]); |
| struct tid_ampdu_tx *tid_tx; |
| |
| /* check if the TID waits for addBA response */ |
| rcu_read_lock(); |
| tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); |
| if (!tid_tx || |
| test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
| rcu_read_unlock(); |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "timer expired on tid %d but we are not " |
| "(or no longer) expecting addBA response there\n", |
| tid); |
| #endif |
| return; |
| } |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); |
| #endif |
| |
| ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| rcu_read_unlock(); |
| } |
| |
| static inline int ieee80211_ac_from_tid(int tid) |
| { |
| return ieee802_1d_to_ac[tid & 7]; |
| } |
| |
| /* |
| * When multiple aggregation sessions on multiple stations |
| * are being created/destroyed simultaneously, we need to |
| * refcount the global queue stop caused by that in order |
| * to not get into a situation where one of the aggregation |
| * setup or teardown re-enables queues before the other is |
| * ready to handle that. |
| * |
| * These two functions take care of this issue by keeping |
| * a global "agg_queue_stop" refcount. |
| */ |
| static void __acquires(agg_queue) |
| ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid) |
| { |
| int queue = ieee80211_ac_from_tid(tid); |
| |
| if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1) |
| ieee80211_stop_queue_by_reason( |
| &local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| __acquire(agg_queue); |
| } |
| |
| static void __releases(agg_queue) |
| ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid) |
| { |
| int queue = ieee80211_ac_from_tid(tid); |
| |
| if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0) |
| ieee80211_wake_queue_by_reason( |
| &local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| __release(agg_queue); |
| } |
| |
| void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| u16 start_seq_num; |
| int ret; |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| /* |
| * 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, 0); |
| 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); |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| spin_unlock_bh(&sta->lock); |
| |
| ieee80211_wake_queue_agg(local, tid); |
| kfree_rcu(tid_tx, rcu_head); |
| 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, |
| local->hw.max_tx_aggregation_subframes, |
| tid_tx->timeout); |
| } |
| |
| int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| u16 timeout) |
| { |
| struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct tid_ampdu_tx *tid_tx; |
| int ret = 0; |
| |
| trace_api_start_tx_ba_session(pubsta, tid); |
| |
| if (WARN_ON(!local->ops->ampdu_action)) |
| return -EINVAL; |
| |
| if ((tid >= STA_TID_NUM) || |
| !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) || |
| (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) |
| return -EINVAL; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n", |
| pubsta->addr, tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| /* |
| * The aggregation code is not prepared to handle |
| * anything but STA/AP due to the BSSID handling. |
| * IBSS could work in the code but isn't supported |
| * by drivers or the standard. |
| */ |
| if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| sdata->vif.type != NL80211_IFTYPE_AP) |
| return -EINVAL; |
| |
| if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "BA sessions blocked. " |
| "Denying BA session request\n"); |
| #endif |
| return -EINVAL; |
| } |
| |
| spin_lock_bh(&sta->lock); |
| |
| /* we have tried too many times, receiver does not want A-MPDU */ |
| if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) { |
| ret = -EBUSY; |
| goto err_unlock_sta; |
| } |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| /* check if the TID is not in aggregation flow already */ |
| if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "BA request denied - session is not " |
| "idle on tid %u\n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| ret = -EAGAIN; |
| goto err_unlock_sta; |
| } |
| |
| /* prepare A-MPDU MLME for Tx aggregation */ |
| tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| if (!tid_tx) { |
| ret = -ENOMEM; |
| goto err_unlock_sta; |
| } |
| |
| skb_queue_head_init(&tid_tx->pending); |
| __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| |
| tid_tx->timeout = timeout; |
| |
| /* Tx timer */ |
| tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired; |
| tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| init_timer(&tid_tx->addba_resp_timer); |
| |
| /* assign a dialog token */ |
| sta->ampdu_mlme.dialog_token_allocator++; |
| tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
| |
| /* |
| * Finally, assign it to the start array; the work item will |
| * collect it and move it to the normal array. |
| */ |
| sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; |
| |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| |
| /* this flow continues off the work */ |
| err_unlock_sta: |
| spin_unlock_bh(&sta->lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| |
| /* |
| * splice packets from the STA's pending to the local pending, |
| * requires a call to ieee80211_agg_splice_finish later |
| */ |
| static void __acquires(agg_queue) |
| ieee80211_agg_splice_packets(struct ieee80211_local *local, |
| struct tid_ampdu_tx *tid_tx, u16 tid) |
| { |
| int queue = ieee80211_ac_from_tid(tid); |
| unsigned long flags; |
| |
| ieee80211_stop_queue_agg(local, tid); |
| |
| if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates" |
| " from the pending queue\n", tid)) |
| return; |
| |
| if (!skb_queue_empty(&tid_tx->pending)) { |
| spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| /* copy over remaining packets */ |
| skb_queue_splice_tail_init(&tid_tx->pending, |
| &local->pending[queue]); |
| spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| } |
| } |
| |
| static void __releases(agg_queue) |
| ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid) |
| { |
| ieee80211_wake_queue_agg(local, tid); |
| } |
| |
| static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| struct sta_info *sta, u16 tid) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid); |
| #endif |
| |
| drv_ampdu_action(local, sta->sdata, |
| IEEE80211_AMPDU_TX_OPERATIONAL, |
| &sta->sta, tid, NULL, tid_tx->buf_size); |
| |
| /* |
| * synchronize with TX path, while splicing the TX path |
| * should block so it won't put more packets onto pending. |
| */ |
| spin_lock_bh(&sta->lock); |
| |
| ieee80211_agg_splice_packets(local, tid_tx, tid); |
| /* |
| * Now mark as operational. This will be visible |
| * in the TX path, and lets it go lock-free in |
| * the common case. |
| */ |
| set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| ieee80211_agg_splice_finish(local, tid); |
| |
| spin_unlock_bh(&sta->lock); |
| } |
| |
| void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct tid_ampdu_tx *tid_tx; |
| |
| trace_api_start_tx_ba_cb(sdata, ra, tid); |
| |
| if (tid >= STA_TID_NUM) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| tid, STA_TID_NUM); |
| #endif |
| return; |
| } |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, ra); |
| if (!sta) { |
| mutex_unlock(&local->sta_mtx); |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| #endif |
| return; |
| } |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| if (WARN_ON(!tid_tx)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "addBA was not requested!\n"); |
| #endif |
| goto unlock; |
| } |
| |
| if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
| goto unlock; |
| |
| if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
| ieee80211_agg_tx_operational(local, sta, tid); |
| |
| unlock: |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| mutex_unlock(&local->sta_mtx); |
| } |
| |
| void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_ra_tid *ra_tid; |
| struct sk_buff *skb = dev_alloc_skb(0); |
| |
| if (unlikely(!skb)) |
| return; |
| |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| |
| skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START; |
| skb_queue_tail(&sdata->skb_queue, skb); |
| ieee80211_queue_work(&local->hw, &sdata->work); |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| |
| int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| enum ieee80211_back_parties initiator, |
| bool tx) |
| { |
| int ret; |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| |
| ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx); |
| |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| |
| return ret; |
| } |
| |
| int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
| { |
| struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct tid_ampdu_tx *tid_tx; |
| int ret = 0; |
| |
| trace_api_stop_tx_ba_session(pubsta, tid); |
| |
| if (!local->ops->ampdu_action) |
| return -EINVAL; |
| |
| if (tid >= STA_TID_NUM) |
| return -EINVAL; |
| |
| spin_lock_bh(&sta->lock); |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| if (!tid_tx) { |
| ret = -ENOENT; |
| goto unlock; |
| } |
| |
| if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| /* already in progress stopping it */ |
| ret = 0; |
| goto unlock; |
| } |
| |
| set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| |
| unlock: |
| spin_unlock_bh(&sta->lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| |
| void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct tid_ampdu_tx *tid_tx; |
| |
| trace_api_stop_tx_ba_cb(sdata, ra, tid); |
| |
| if (tid >= STA_TID_NUM) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n", |
| tid, STA_TID_NUM); |
| #endif |
| return; |
| } |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n", |
| ra, tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| mutex_lock(&local->sta_mtx); |
| |
| sta = sta_info_get(sdata, ra); |
| if (!sta) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| #endif |
| goto unlock; |
| } |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| spin_lock_bh(&sta->lock); |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); |
| #endif |
| goto unlock_sta; |
| } |
| |
| if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
| ieee80211_send_delba(sta->sdata, ra, tid, |
| WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| |
| /* |
| * When we get here, the TX path will not be lockless any more wrt. |
| * aggregation, since the OPERATIONAL bit has long been cleared. |
| * Thus it will block on getting the lock, if it occurs. So if we |
| * stop the queue now, we will not get any more packets, and any |
| * that might be being processed will wait for us here, thereby |
| * guaranteeing that no packets go to the tid_tx pending queue any |
| * more. |
| */ |
| |
| ieee80211_agg_splice_packets(local, tid_tx, tid); |
| |
| /* future packets must not find the tid_tx struct any more */ |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| |
| ieee80211_agg_splice_finish(local, tid); |
| |
| kfree_rcu(tid_tx, rcu_head); |
| |
| unlock_sta: |
| spin_unlock_bh(&sta->lock); |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| unlock: |
| mutex_unlock(&local->sta_mtx); |
| } |
| |
| void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_ra_tid *ra_tid; |
| struct sk_buff *skb = dev_alloc_skb(0); |
| |
| if (unlikely(!skb)) |
| return; |
| |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| |
| skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP; |
| skb_queue_tail(&sdata->skb_queue, skb); |
| ieee80211_queue_work(&local->hw, &sdata->work); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| |
| |
| void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| struct sta_info *sta, |
| struct ieee80211_mgmt *mgmt, |
| size_t len) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| u16 capab, tid; |
| u8 buf_size; |
| |
| capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| if (!tid_tx) |
| goto out; |
| |
| if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); |
| #endif |
| goto out; |
| } |
| |
| del_timer(&tid_tx->addba_resp_timer); |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid); |
| #endif |
| /* |
| * IEEE 802.11-2007 7.3.1.14: |
| * In an ADDBA Response frame, when the Status Code field |
| * is set to 0, the Buffer Size subfield is set to a value |
| * of at least 1. |
| */ |
| if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
| == WLAN_STATUS_SUCCESS && buf_size) { |
| if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
| &tid_tx->state)) { |
| /* ignore duplicate response */ |
| goto out; |
| } |
| |
| tid_tx->buf_size = buf_size; |
| |
| if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
| ieee80211_agg_tx_operational(local, sta, tid); |
| |
| sta->ampdu_mlme.addba_req_num[tid] = 0; |
| } else { |
| ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, |
| true); |
| } |
| |
| out: |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| } |