| /* |
| * 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 2007-2009, 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 <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "wme.h" |
| |
| /** |
| * DOC: TX aggregation |
| * |
| * Aggregation on the TX side requires setting the hardware flag |
| * %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues |
| * hardware parameter to the number of hardware AMPDU queues. If there are no |
| * hardware queues then the driver will (currently) have to do all frame |
| * buffering. |
| * |
| * 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() (or ieee80211_start_tx_ba_cb_irqsafe()) |
| * function, which will start the aggregation session. |
| * |
| * Similarly, when the aggregation session is stopped by |
| * 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() |
| * (or 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) { |
| printk(KERN_ERR "%s: failed to allocate buffer " |
| "for addba request frame\n", sdata->dev->name); |
| 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->dev->dev_addr, ETH_ALEN); |
| if (sdata->vif.type == NL80211_IFTYPE_AP || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| memcpy(mgmt->bssid, sdata->dev->dev_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) { |
| printk(KERN_ERR "%s: failed to allocate buffer for " |
| "bar frame\n", sdata->dev->name); |
| 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->dev->dev_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 << 12); |
| 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); |
| } |
| |
| int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| enum ieee80211_back_parties initiator) |
| { |
| struct ieee80211_local *local = sta->local; |
| int ret; |
| u8 *state; |
| |
| #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 */ |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| |
| if (*state == HT_AGG_STATE_OPERATIONAL) |
| sta->ampdu_mlme.addba_req_num[tid] = 0; |
| |
| *state = HT_AGG_STATE_REQ_STOP_BA_MSK | |
| (initiator << HT_AGG_STATE_INITIATOR_SHIFT); |
| |
| ret = drv_ampdu_action(local, &sta->sdata->vif, |
| IEEE80211_AMPDU_TX_STOP, |
| &sta->sta, tid, NULL); |
| |
| /* 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]); |
| u8 *state; |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| |
| /* check if the TID waits for addBA response */ |
| spin_lock_bh(&sta->lock); |
| if ((*state & (HT_ADDBA_REQUESTED_MSK | HT_ADDBA_RECEIVED_MSK)) != |
| HT_ADDBA_REQUESTED_MSK) { |
| spin_unlock_bh(&sta->lock); |
| *state = HT_AGG_STATE_IDLE; |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "timer expired on tid %d but we are not " |
| "(or no longer) expecting addBA response there", |
| 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, tid, WLAN_BACK_INITIATOR); |
| spin_unlock_bh(&sta->lock); |
| } |
| |
| static inline int ieee80211_ac_from_tid(int tid) |
| { |
| return ieee802_1d_to_ac[tid & 7]; |
| } |
| |
| int ieee80211_start_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; |
| u8 *state; |
| int ret = 0; |
| u16 start_seq_num; |
| |
| if (WARN_ON(!local->ops->ampdu_action)) |
| return -EINVAL; |
| |
| if ((tid >= STA_TID_NUM) || |
| !(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) |
| 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_SUSPEND)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Suspend in progress. " |
| "Denying BA session request\n"); |
| #endif |
| return -EINVAL; |
| } |
| |
| spin_lock_bh(&sta->lock); |
| spin_lock(&local->ampdu_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; |
| } |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| /* check if the TID is not in aggregation flow already */ |
| if (*state != HT_AGG_STATE_IDLE) { |
| #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; |
| } |
| |
| /* |
| * 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_by_reason( |
| &local->hw, ieee80211_ac_from_tid(tid), |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| |
| /* prepare A-MPDU MLME for Tx aggregation */ |
| sta->ampdu_mlme.tid_tx[tid] = |
| kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| if (!sta->ampdu_mlme.tid_tx[tid]) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_ERR "allocate tx mlme to tid %d failed\n", |
| tid); |
| #endif |
| ret = -ENOMEM; |
| goto err_wake_queue; |
| } |
| |
| skb_queue_head_init(&sta->ampdu_mlme.tid_tx[tid]->pending); |
| |
| /* Tx timer */ |
| sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function = |
| sta_addba_resp_timer_expired; |
| sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data = |
| (unsigned long)&sta->timer_to_tid[tid]; |
| init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| |
| /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the |
| * call back right away, it must see that the flow has begun */ |
| *state |= HT_ADDBA_REQUESTED_MSK; |
| |
| start_seq_num = sta->tid_seq[tid]; |
| |
| ret = drv_ampdu_action(local, &sdata->vif, |
| IEEE80211_AMPDU_TX_START, |
| pubsta, 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 /* CONFIG_MAC80211_HT_DEBUG */ |
| *state = HT_AGG_STATE_IDLE; |
| goto err_free; |
| } |
| |
| /* Driver vetoed or OKed, but we can take packets again now */ |
| ieee80211_wake_queue_by_reason( |
| &local->hw, ieee80211_ac_from_tid(tid), |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| |
| spin_unlock(&local->ampdu_lock); |
| spin_unlock_bh(&sta->lock); |
| |
| /* send an addBA request */ |
| sta->ampdu_mlme.dialog_token_allocator++; |
| sta->ampdu_mlme.tid_tx[tid]->dialog_token = |
| sta->ampdu_mlme.dialog_token_allocator; |
| sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num; |
| |
| ieee80211_send_addba_request(sdata, pubsta->addr, tid, |
| sta->ampdu_mlme.tid_tx[tid]->dialog_token, |
| sta->ampdu_mlme.tid_tx[tid]->ssn, |
| 0x40, 5000); |
| sta->ampdu_mlme.addba_req_num[tid]++; |
| /* activate the timer for the recipient's addBA response */ |
| sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires = |
| jiffies + ADDBA_RESP_INTERVAL; |
| add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid); |
| #endif |
| return 0; |
| |
| err_free: |
| kfree(sta->ampdu_mlme.tid_tx[tid]); |
| sta->ampdu_mlme.tid_tx[tid] = NULL; |
| err_wake_queue: |
| ieee80211_wake_queue_by_reason( |
| &local->hw, ieee80211_ac_from_tid(tid), |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| err_unlock_sta: |
| spin_unlock(&local->ampdu_lock); |
| 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 and holding |
| * local->ampdu_lock across both calls. |
| */ |
| static void ieee80211_agg_splice_packets(struct ieee80211_local *local, |
| struct sta_info *sta, u16 tid) |
| { |
| unsigned long flags; |
| u16 queue = ieee80211_ac_from_tid(tid); |
| |
| ieee80211_stop_queue_by_reason( |
| &local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| |
| if (!(sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)) |
| return; |
| |
| if (WARN(!sta->ampdu_mlme.tid_tx[tid], |
| "TID %d gone but expected when splicing aggregates from" |
| "the pending queue\n", tid)) |
| return; |
| |
| if (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { |
| spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| /* copy over remaining packets */ |
| skb_queue_splice_tail_init( |
| &sta->ampdu_mlme.tid_tx[tid]->pending, |
| &local->pending[queue]); |
| spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| } |
| } |
| |
| static void ieee80211_agg_splice_finish(struct ieee80211_local *local, |
| struct sta_info *sta, u16 tid) |
| { |
| u16 queue = ieee80211_ac_from_tid(tid); |
| |
| ieee80211_wake_queue_by_reason( |
| &local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION); |
| } |
| |
| /* caller must hold sta->lock */ |
| static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| struct sta_info *sta, u16 tid) |
| { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid); |
| #endif |
| |
| spin_lock(&local->ampdu_lock); |
| ieee80211_agg_splice_packets(local, sta, tid); |
| /* |
| * NB: we rely on sta->lock being taken in the TX |
| * processing here when adding to the pending queue, |
| * otherwise we could only change the state of the |
| * session to OPERATIONAL _here_. |
| */ |
| ieee80211_agg_splice_finish(local, sta, tid); |
| spin_unlock(&local->ampdu_lock); |
| |
| drv_ampdu_action(local, &sta->sdata->vif, |
| IEEE80211_AMPDU_TX_OPERATIONAL, |
| &sta->sta, tid, NULL); |
| } |
| |
| 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; |
| u8 *state; |
| |
| 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; |
| } |
| |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, ra); |
| if (!sta) { |
| rcu_read_unlock(); |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| #endif |
| return; |
| } |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| spin_lock_bh(&sta->lock); |
| |
| if (WARN_ON(!(*state & HT_ADDBA_REQUESTED_MSK))) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "addBA was not requested yet, state is %d\n", |
| *state); |
| #endif |
| spin_unlock_bh(&sta->lock); |
| rcu_read_unlock(); |
| return; |
| } |
| |
| if (WARN_ON(*state & HT_ADDBA_DRV_READY_MSK)) |
| goto out; |
| |
| *state |= HT_ADDBA_DRV_READY_MSK; |
| |
| if (*state == HT_AGG_STATE_OPERATIONAL) |
| ieee80211_agg_tx_operational(local, sta, tid); |
| |
| out: |
| spin_unlock_bh(&sta->lock); |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_cb); |
| |
| 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)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_WARNING "%s: Not enough memory, " |
| "dropping start BA session", skb->dev->name); |
| #endif |
| return; |
| } |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| ra_tid->vif = vif; |
| |
| skb->pkt_type = IEEE80211_ADDBA_MSG; |
| skb_queue_tail(&local->skb_queue, skb); |
| tasklet_schedule(&local->tasklet); |
| } |
| 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) |
| { |
| u8 *state; |
| int ret; |
| |
| /* check if the TID is in aggregation */ |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| spin_lock_bh(&sta->lock); |
| |
| if (*state != HT_AGG_STATE_OPERATIONAL) { |
| ret = -ENOENT; |
| goto unlock; |
| } |
| |
| ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator); |
| |
| unlock: |
| spin_unlock_bh(&sta->lock); |
| return ret; |
| } |
| |
| int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| enum ieee80211_back_parties initiator) |
| { |
| 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; |
| |
| if (!local->ops->ampdu_action) |
| return -EINVAL; |
| |
| if (tid >= STA_TID_NUM) |
| return -EINVAL; |
| |
| return __ieee80211_stop_tx_ba_session(sta, tid, initiator); |
| } |
| 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; |
| u8 *state; |
| |
| 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 */ |
| |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, ra); |
| if (!sta) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Could not find station: %pM\n", ra); |
| #endif |
| rcu_read_unlock(); |
| return; |
| } |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| |
| /* NOTE: no need to use sta->lock in this state check, as |
| * ieee80211_stop_tx_ba_session will let only one stop call to |
| * pass through per sta/tid |
| */ |
| if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n"); |
| #endif |
| rcu_read_unlock(); |
| return; |
| } |
| |
| if (*state & HT_AGG_STATE_INITIATOR_MSK) |
| ieee80211_send_delba(sta->sdata, ra, tid, |
| WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| |
| spin_lock_bh(&sta->lock); |
| spin_lock(&local->ampdu_lock); |
| |
| ieee80211_agg_splice_packets(local, sta, tid); |
| |
| *state = HT_AGG_STATE_IDLE; |
| /* from now on packets are no longer put onto sta->pending */ |
| kfree(sta->ampdu_mlme.tid_tx[tid]); |
| sta->ampdu_mlme.tid_tx[tid] = NULL; |
| |
| ieee80211_agg_splice_finish(local, sta, tid); |
| |
| spin_unlock(&local->ampdu_lock); |
| spin_unlock_bh(&sta->lock); |
| |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb); |
| |
| 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)) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_WARNING "%s: Not enough memory, " |
| "dropping stop BA session", skb->dev->name); |
| #endif |
| return; |
| } |
| ra_tid = (struct ieee80211_ra_tid *) &skb->cb; |
| memcpy(&ra_tid->ra, ra, ETH_ALEN); |
| ra_tid->tid = tid; |
| ra_tid->vif = vif; |
| |
| skb->pkt_type = IEEE80211_DELBA_MSG; |
| skb_queue_tail(&local->skb_queue, skb); |
| tasklet_schedule(&local->tasklet); |
| } |
| 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) |
| { |
| u16 capab, tid; |
| u8 *state; |
| |
| capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| |
| spin_lock_bh(&sta->lock); |
| |
| if (!(*state & HT_ADDBA_REQUESTED_MSK)) |
| goto out; |
| |
| if (mgmt->u.action.u.addba_resp.dialog_token != |
| sta->ampdu_mlme.tid_tx[tid]->dialog_token) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| goto out; |
| } |
| |
| del_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer); |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
| == WLAN_STATUS_SUCCESS) { |
| u8 curstate = *state; |
| |
| *state |= HT_ADDBA_RECEIVED_MSK; |
| |
| if (*state != curstate && *state == HT_AGG_STATE_OPERATIONAL) |
| 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); |
| } |
| |
| out: |
| spin_unlock_bh(&sta->lock); |
| } |