diff options
Diffstat (limited to 'net/mac80211/agg-tx.c')
| -rw-r--r-- | net/mac80211/agg-tx.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c new file mode 100644 index 000000000000..947aaaad35d2 --- /dev/null +++ b/net/mac80211/agg-tx.c @@ -0,0 +1,695 @@ +/* + * 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 "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, 1); +} + +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_tx_skb(sdata, skb, 0); +} + +static 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; + + state = &sta->ampdu_mlme.tid_state_tx[tid]; + + *state = HT_AGG_STATE_REQ_STOP_BA_MSK | + (initiator << HT_AGG_STATE_INITIATOR_SHIFT); + + ret = local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_STOP, + &sta->sta, tid, NULL); + + /* HW shall not deny going back to legacy */ + if (WARN_ON(ret)) { + *state = HT_AGG_STATE_OPERATIONAL; + /* + * 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)) { + 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 " + "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_hw *hw, u8 *ra, u16 tid) +{ + struct ieee80211_local *local = hw_to_local(hw); + struct sta_info *sta; + struct ieee80211_sub_if_data *sdata; + u8 *state; + int ret = 0; + u16 start_seq_num; + + if (WARN_ON(!local->ops->ampdu_action)) + return -EINVAL; + + if ((tid >= STA_TID_NUM) || !(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", + ra, tid); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + + rcu_read_lock(); + + sta = sta_info_get(local, ra); + if (!sta) { +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "Could not find the station\n"); +#endif + ret = -ENOENT; + goto unlock; + } + + /* + * 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 (sta->sdata->vif.type != NL80211_IFTYPE_STATION && + sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN && + sta->sdata->vif.type != NL80211_IFTYPE_AP) { + ret = -EINVAL; + goto unlock; + } + + 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 + ret = -EINVAL; + goto unlock; + } + + spin_lock_bh(&sta->lock); + spin_lock(&local->ampdu_lock); + + sdata = sta->sdata; + + /* 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 = local->ops->ampdu_action(hw, 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 /* 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(sta->sdata, ra, tid, + sta->ampdu_mlme.tid_tx[tid]->dialog_token, + sta->ampdu_mlme.tid_tx[tid]->ssn, + 0x40, 5000); + /* 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 + goto unlock; + + 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); + unlock: + rcu_read_unlock(); + 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 (!skb_queue_empty(&sta->ampdu_mlme.tid_tx[tid]->pending)) { + spin_lock_irqsave(&local->queue_stop_reason_lock, flags); + /* mark queue as pending, it is stopped already */ + __set_bit(IEEE80211_QUEUE_STOP_REASON_PENDING, + &local->queue_stop_reasons[queue]); + /* 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); + + local->ops->ampdu_action(&local->hw, IEEE80211_AMPDU_TX_OPERATIONAL, + &sta->sta, tid, NULL); +} + +void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid) +{ + struct ieee80211_local *local = hw_to_local(hw); + 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(local, 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_hw *hw, + const u8 *ra, u16 tid) +{ + struct ieee80211_local *local = hw_to_local(hw); + 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; + + 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; + } + +#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 */ + + 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_hw *hw, + u8 *ra, u16 tid, + enum ieee80211_back_parties initiator) +{ + struct ieee80211_local *local = hw_to_local(hw); + struct sta_info *sta; + int ret = 0; + + if (WARN_ON(!local->ops->ampdu_action)) + return -EINVAL; + + if (tid >= STA_TID_NUM) + return -EINVAL; + + rcu_read_lock(); + sta = sta_info_get(local, ra); + if (!sta) { + rcu_read_unlock(); + return -ENOENT; + } + + ret = __ieee80211_stop_tx_ba_session(sta, tid, initiator); + rcu_read_unlock(); + return ret; +} +EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); + +void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid) +{ + struct ieee80211_local *local = hw_to_local(hw); + 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(local, 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 */ + sta->ampdu_mlme.addba_req_num[tid] = 0; + 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_hw *hw, + const u8 *ra, u16 tid) +{ + struct ieee80211_local *local = hw_to_local(hw); + 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; + + 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)) { + spin_unlock_bh(&sta->lock); + return; + } + + if (mgmt->u.action.u.addba_resp.dialog_token != + sta->ampdu_mlme.tid_tx[tid]->dialog_token) { + spin_unlock_bh(&sta->lock); +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + return; + } + + del_timer_sync(&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 { + sta->ampdu_mlme.addba_req_num[tid]++; + ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR); + } + spin_unlock_bh(&sta->lock); +} |
