mac80211: restructure HT code
authorJohannes Berg <johannes@sipsolutions.net>
Tue, 10 Feb 2009 20:25:46 +0000 (21:25 +0100)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 13 Feb 2009 18:45:34 +0000 (13:45 -0500)
Create two new files, agg-tx.c and agg-rx.c to make it clearer
which code is common (ht.c) and which is specific (agg-*.c).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/Makefile
net/mac80211/agg-rx.c [new file with mode: 0644]
net/mac80211/agg-tx.c [new file with mode: 0644]
net/mac80211/ht.c
net/mac80211/ieee80211_i.h

index 58c94bb..3503a3d 100644 (file)
@@ -8,7 +8,7 @@ mac80211-y := \
        wep.o \
        wpa.o \
        scan.o \
-       ht.o \
+       ht.o agg-tx.o agg-rx.o \
        mlme.o \
        iface.o \
        rate.o \
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
new file mode 100644 (file)
index 0000000..62b9feb
--- /dev/null
@@ -0,0 +1,287 @@
+/*
+ * 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 2007-2008, 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"
+
+void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
+                                       u16 initiator, u16 reason)
+{
+       struct ieee80211_local *local = sdata->local;
+       struct ieee80211_hw *hw = &local->hw;
+       struct sta_info *sta;
+       int ret, i;
+
+       rcu_read_lock();
+
+       sta = sta_info_get(local, ra);
+       if (!sta) {
+               rcu_read_unlock();
+               return;
+       }
+
+       /* check if TID is in operational state */
+       spin_lock_bh(&sta->lock);
+       if (sta->ampdu_mlme.tid_state_rx[tid]
+                               != HT_AGG_STATE_OPERATIONAL) {
+               spin_unlock_bh(&sta->lock);
+               rcu_read_unlock();
+               return;
+       }
+       sta->ampdu_mlme.tid_state_rx[tid] =
+               HT_AGG_STATE_REQ_STOP_BA_MSK |
+               (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
+       spin_unlock_bh(&sta->lock);
+
+       /* stop HW Rx aggregation. ampdu_action existence
+        * already verified in session init so we add the BUG_ON */
+       BUG_ON(!local->ops->ampdu_action);
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+       printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
+              ra, tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+       ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
+                                      &sta->sta, tid, NULL);
+       if (ret)
+               printk(KERN_DEBUG "HW problem - can not stop rx "
+                               "aggregation for tid %d\n", tid);
+
+       /* shutdown timer has not expired */
+       if (initiator != WLAN_BACK_TIMER)
+               del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
+
+       /* check if this is a self generated aggregation halt */
+       if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
+               ieee80211_send_delba(sdata, ra, tid, 0, reason);
+
+       /* free the reordering buffer */
+       for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
+               if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
+                       /* release the reordered frames */
+                       dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
+                       sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
+                       sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
+               }
+       }
+       /* free resources */
+       kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
+       kfree(sta->ampdu_mlme.tid_rx[tid]);
+       sta->ampdu_mlme.tid_rx[tid] = NULL;
+       sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
+
+       rcu_read_unlock();
+}
+
+/*
+ * After accepting the AddBA Request we activated a timer,
+ * resetting it after each frame that arrives from the originator.
+ * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
+ */
+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_HT_DEBUG
+       printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
+#endif
+       ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
+                                        (u16)*ptid, WLAN_BACK_TIMER,
+                                        WLAN_REASON_QSTA_TIMEOUT);
+}
+
+static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
+                                     u8 dialog_token, u16 status, u16 policy,
+                                     u16 buf_size, u16 timeout)
+{
+       struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+       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_DEBUG "%s: failed to allocate buffer "
+                      "for addba resp 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)
+               memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
+       else
+               memcpy(mgmt->bssid, ifsta->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_resp));
+       mgmt->u.action.category = WLAN_CATEGORY_BACK;
+       mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
+       mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
+
+       capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
+       capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
+       capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
+
+       mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
+       mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
+       mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
+
+       ieee80211_tx_skb(sdata, skb, 1);
+}
+
+void ieee80211_process_addba_request(struct ieee80211_local *local,
+                                    struct sta_info *sta,
+                                    struct ieee80211_mgmt *mgmt,
+                                    size_t len)
+{
+       struct ieee80211_hw *hw = &local->hw;
+       struct ieee80211_conf *conf = &hw->conf;
+       struct tid_ampdu_rx *tid_agg_rx;
+       u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
+       u8 dialog_token;
+       int ret = -EOPNOTSUPP;
+
+       /* 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;
+
+       /* 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;
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               if (net_ratelimit())
+                       printk(KERN_DEBUG "AddBA Req with bad params from "
+                               "%pM on tid %u. policy %d, buffer size %d\n",
+                               mgmt->sa, tid, ba_policy,
+                               buf_size);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+               goto end_no_lock;
+       }
+       /* determine default buffer size */
+       if (buf_size == 0) {
+               struct ieee80211_supported_band *sband;
+
+               sband = local->hw.wiphy->bands[conf->channel->band];
+               buf_size = IEEE80211_MIN_AMPDU_BUF;
+               buf_size = buf_size << sband->ht_cap.ampdu_factor;
+       }
+
+
+       /* examine state machine */
+       spin_lock_bh(&sta->lock);
+
+       if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               if (net_ratelimit())
+                       printk(KERN_DEBUG "unexpected AddBA Req from "
+                               "%pM on tid %u\n",
+                               mgmt->sa, tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+               goto end;
+       }
+
+       /* prepare A-MPDU MLME for Rx aggregation */
+       sta->ampdu_mlme.tid_rx[tid] =
+                       kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
+       if (!sta->ampdu_mlme.tid_rx[tid]) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               if (net_ratelimit())
+                       printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
+                                       tid);
+#endif
+               goto end;
+       }
+       /* rx timer */
+       sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
+                               sta_rx_agg_session_timer_expired;
+       sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
+                               (unsigned long)&sta->timer_to_tid[tid];
+       init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
+
+       tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
+
+       /* prepare reordering buffer */
+       tid_agg_rx->reorder_buf =
+               kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
+       if (!tid_agg_rx->reorder_buf) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               if (net_ratelimit())
+                       printk(KERN_ERR "can not allocate reordering buffer "
+                              "to tid %d\n", tid);
+#endif
+               kfree(sta->ampdu_mlme.tid_rx[tid]);
+               goto end;
+       }
+
+       if (local->ops->ampdu_action)
+               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
+                                              &sta->sta, tid, &start_seq_num);
+#ifdef CONFIG_MAC80211_HT_DEBUG
+       printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+       if (ret) {
+               kfree(tid_agg_rx->reorder_buf);
+               kfree(tid_agg_rx);
+               sta->ampdu_mlme.tid_rx[tid] = NULL;
+               goto end;
+       }
+
+       /* change state and send addba resp */
+       sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
+       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;
+end:
+       spin_unlock_bh(&sta->lock);
+
+end_no_lock:
+       ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
+                                 dialog_token, status, 1, buf_size, timeout);
+}
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
new file mode 100644 (file)
index 0000000..6ab731f
--- /dev/null
@@ -0,0 +1,593 @@
+/*
+ * 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"
+
+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 ieee80211_if_sta *ifsta = &sdata->u.sta;
+       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)
+               memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
+       else
+               memcpy(mgmt->bssid, ifsta->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);
+}
+
+/*
+ * 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 *temp_sta = container_of((void *)data,
+               struct sta_info, timer_to_tid[tid]);
+
+       struct ieee80211_local *local = temp_sta->local;
+       struct ieee80211_hw *hw = &local->hw;
+       struct sta_info *sta;
+       u8 *state;
+
+       rcu_read_lock();
+
+       sta = sta_info_get(local, temp_sta->sta.addr);
+       if (!sta) {
+               rcu_read_unlock();
+               return;
+       }
+
+       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
+               goto timer_expired_exit;
+       }
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+       printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
+#endif
+
+       /* go through the state check in stop_BA_session */
+       *state = HT_AGG_STATE_OPERATIONAL;
+       spin_unlock_bh(&sta->lock);
+       ieee80211_stop_tx_ba_session(hw, temp_sta->sta.addr, tid,
+                                    WLAN_BACK_INITIATOR);
+
+timer_expired_exit:
+       rcu_read_unlock();
+}
+
+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;
+       u16 start_seq_num;
+       u8 *state;
+       int ret = 0;
+
+       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 exit;
+       }
+
+       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;
+       }
+
+       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;
+       }
+
+       /* 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_unlock_sta;
+       }
+       /* 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);
+
+       if (hw->ampdu_queues) {
+               /* create a new queue for this aggregation */
+               ret = ieee80211_ht_agg_queue_add(local, sta, tid);
+
+               /* case no queue is available to aggregation
+                * don't switch to aggregation */
+               if (ret) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+                       printk(KERN_DEBUG "BA request denied - "
+                              "queue unavailable for tid %d\n", tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+                       goto err_unlock_queue;
+               }
+       }
+       sdata = sta->sdata;
+
+       /* 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;
+
+       /* This is slightly racy because the queue isn't stopped */
+       start_seq_num = sta->tid_seq[tid];
+
+       if (local->ops->ampdu_action)
+               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
+                                              &sta->sta, tid, &start_seq_num);
+
+       if (ret) {
+               /* No need to requeue the packets in the agg queue, since we
+                * held the tx lock: no packet could be enqueued to the newly
+                * allocated queue */
+               if (hw->ampdu_queues)
+                       ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
+#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_unlock_queue;
+       }
+
+       /* Will put all the packets in the new SW queue */
+       if (hw->ampdu_queues)
+               ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
+       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 exit;
+
+err_unlock_queue:
+       kfree(sta->ampdu_mlme.tid_tx[tid]);
+       sta->ampdu_mlme.tid_tx[tid] = NULL;
+       ret = -EBUSY;
+err_unlock_sta:
+       spin_unlock_bh(&sta->lock);
+exit:
+       rcu_read_unlock();
+       return ret;
+}
+EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
+
+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 (!(*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;
+       }
+
+       WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
+
+       *state |= HT_ADDBA_DRV_READY_MSK;
+
+       if (*state == HT_AGG_STATE_OPERATIONAL) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
+#endif
+               if (hw->ampdu_queues)
+                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+       }
+       spin_unlock_bh(&sta->lock);
+       rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
+
+
+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;
+       u8 *state;
+       int ret = 0;
+
+       if (tid >= STA_TID_NUM)
+               return -EINVAL;
+
+       rcu_read_lock();
+       sta = sta_info_get(local, ra);
+       if (!sta) {
+               rcu_read_unlock();
+               return -ENOENT;
+       }
+
+       /* 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 stop_BA_exit;
+       }
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+       printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
+              ra, tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+       if (hw->ampdu_queues)
+               ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
+
+       *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
+               (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
+
+       if (local->ops->ampdu_action)
+               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
+                                              &sta->sta, tid, NULL);
+
+       /* case HW denied going back to legacy */
+       if (ret) {
+               WARN_ON(ret != -EBUSY);
+               *state = HT_AGG_STATE_OPERATIONAL;
+               if (hw->ampdu_queues)
+                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+               goto stop_BA_exit;
+       }
+
+stop_BA_exit:
+       spin_unlock_bh(&sta->lock);
+       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;
+       int agg_queue;
+
+       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);
+
+       if (hw->ampdu_queues) {
+               agg_queue = sta->tid_to_tx_q[tid];
+               ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
+
+               /* We just requeued the all the frames that were in the
+                * removed queue, and since we might miss a softirq we do
+                * netif_schedule_queue.  ieee80211_wake_queue is not used
+                * here as this queue is not necessarily stopped
+                */
+               netif_schedule_queue(netdev_get_tx_queue(local->mdev,
+                                                        agg_queue));
+       }
+       spin_lock_bh(&sta->lock);
+       *state = HT_AGG_STATE_IDLE;
+       sta->ampdu_mlme.addba_req_num[tid] = 0;
+       kfree(sta->ampdu_mlme.tid_tx[tid]);
+       sta->ampdu_mlme.tid_tx[tid] = NULL;
+       spin_unlock_bh(&sta->lock);
+
+       rcu_read_unlock();
+}
+EXPORT_SYMBOL(ieee80211_stop_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);
+
+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)
+{
+       struct ieee80211_hw *hw = &local->hw;
+       u16 capab;
+       u16 tid, start_seq_num;
+       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) {
+               *state |= HT_ADDBA_RECEIVED_MSK;
+               sta->ampdu_mlme.addba_req_num[tid] = 0;
+
+               if (*state == HT_AGG_STATE_OPERATIONAL &&
+                   local->hw.ampdu_queues)
+                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+
+               if (local->ops->ampdu_action) {
+                       (void)local->ops->ampdu_action(hw,
+                                              IEEE80211_AMPDU_TX_RESUME,
+                                              &sta->sta, tid, &start_seq_num);
+               }
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+               spin_unlock_bh(&sta->lock);
+       } else {
+               sta->ampdu_mlme.addba_req_num[tid]++;
+               /* this will allow the state check in stop_BA_session */
+               *state = HT_AGG_STATE_OPERATIONAL;
+               spin_unlock_bh(&sta->lock);
+               ieee80211_stop_tx_ba_session(hw, sta->sta.addr, tid,
+                                            WLAN_BACK_INITIATOR);
+       }
+}
index 7a38d2e..869ea5f 100644 (file)
@@ -17,8 +17,6 @@
 #include <net/wireless.h>
 #include <net/mac80211.h>
 #include "ieee80211_i.h"
-#include "sta_info.h"
-#include "wme.h"
 
 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
                                       struct ieee80211_ht_cap *ht_cap_ie,
@@ -155,105 +153,23 @@ u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
        return changed;
 }
 
-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 ieee80211_if_sta *ifsta = &sdata->u.sta;
-       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)
-               memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
-       else
-               memcpy(mgmt->bssid, ifsta->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);
-}
-
-static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
-                                     u8 dialog_token, u16 status, u16 policy,
-                                     u16 buf_size, u16 timeout)
+void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
 {
-       struct ieee80211_if_sta *ifsta = &sdata->u.sta;
        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);
+       int i;
 
-       if (!skb) {
-               printk(KERN_DEBUG "%s: failed to allocate buffer "
-                      "for addba resp frame\n", sdata->dev->name);
-               return;
+       for (i = 0; i <  STA_TID_NUM; i++) {
+               ieee80211_stop_tx_ba_session(&local->hw, addr, i,
+                                            WLAN_BACK_INITIATOR);
+               ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
+                                                WLAN_BACK_RECIPIENT,
+                                                WLAN_REASON_QSTA_LEAVE_QBSS);
        }
-
-       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)
-               memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
-       else
-               memcpy(mgmt->bssid, ifsta->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_resp));
-       mgmt->u.action.category = WLAN_CATEGORY_BACK;
-       mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
-       mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
-
-       capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
-       capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
-       capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
-
-       mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
-       mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
-       mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
-
-       ieee80211_tx_skb(sdata, skb, 1);
 }
 
-static void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
-                                const u8 *da, u16 tid,
-                                u16 initiator, u16 reason_code)
+void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
+                         const u8 *da, u16 tid,
+                         u16 initiator, u16 reason_code)
 {
        struct ieee80211_local *local = sdata->local;
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
@@ -294,767 +210,6 @@ static void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
        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);
-}
-
-void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
-                                       u16 initiator, u16 reason)
-{
-       struct ieee80211_local *local = sdata->local;
-       struct ieee80211_hw *hw = &local->hw;
-       struct sta_info *sta;
-       int ret, i;
-
-       rcu_read_lock();
-
-       sta = sta_info_get(local, ra);
-       if (!sta) {
-               rcu_read_unlock();
-               return;
-       }
-
-       /* check if TID is in operational state */
-       spin_lock_bh(&sta->lock);
-       if (sta->ampdu_mlme.tid_state_rx[tid]
-                               != HT_AGG_STATE_OPERATIONAL) {
-               spin_unlock_bh(&sta->lock);
-               rcu_read_unlock();
-               return;
-       }
-       sta->ampdu_mlme.tid_state_rx[tid] =
-               HT_AGG_STATE_REQ_STOP_BA_MSK |
-               (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
-       spin_unlock_bh(&sta->lock);
-
-       /* stop HW Rx aggregation. ampdu_action existence
-        * already verified in session init so we add the BUG_ON */
-       BUG_ON(!local->ops->ampdu_action);
-
-#ifdef CONFIG_MAC80211_HT_DEBUG
-       printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
-              ra, tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-
-       ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
-                                      &sta->sta, tid, NULL);
-       if (ret)
-               printk(KERN_DEBUG "HW problem - can not stop rx "
-                               "aggregation for tid %d\n", tid);
-
-       /* shutdown timer has not expired */
-       if (initiator != WLAN_BACK_TIMER)
-               del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
-
-       /* check if this is a self generated aggregation halt */
-       if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
-               ieee80211_send_delba(sdata, ra, tid, 0, reason);
-
-       /* free the reordering buffer */
-       for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
-               if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
-                       /* release the reordered frames */
-                       dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
-                       sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
-                       sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
-               }
-       }
-       /* free resources */
-       kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
-       kfree(sta->ampdu_mlme.tid_rx[tid]);
-       sta->ampdu_mlme.tid_rx[tid] = NULL;
-       sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
-
-       rcu_read_unlock();
-}
-
-
-/*
- * 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 *temp_sta = container_of((void *)data,
-               struct sta_info, timer_to_tid[tid]);
-
-       struct ieee80211_local *local = temp_sta->local;
-       struct ieee80211_hw *hw = &local->hw;
-       struct sta_info *sta;
-       u8 *state;
-
-       rcu_read_lock();
-
-       sta = sta_info_get(local, temp_sta->sta.addr);
-       if (!sta) {
-               rcu_read_unlock();
-               return;
-       }
-
-       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
-               goto timer_expired_exit;
-       }
-
-#ifdef CONFIG_MAC80211_HT_DEBUG
-       printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
-#endif
-
-       /* go through the state check in stop_BA_session */
-       *state = HT_AGG_STATE_OPERATIONAL;
-       spin_unlock_bh(&sta->lock);
-       ieee80211_stop_tx_ba_session(hw, temp_sta->sta.addr, tid,
-                                    WLAN_BACK_INITIATOR);
-
-timer_expired_exit:
-       rcu_read_unlock();
-}
-
-void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
-{
-       struct ieee80211_local *local = sdata->local;
-       int i;
-
-       for (i = 0; i <  STA_TID_NUM; i++) {
-               ieee80211_stop_tx_ba_session(&local->hw, addr, i,
-                                            WLAN_BACK_INITIATOR);
-               ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
-                                                WLAN_BACK_RECIPIENT,
-                                                WLAN_REASON_QSTA_LEAVE_QBSS);
-       }
-}
-
-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;
-       u16 start_seq_num;
-       u8 *state;
-       int ret = 0;
-
-       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 exit;
-       }
-
-       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;
-       }
-
-       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;
-       }
-
-       /* 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_unlock_sta;
-       }
-       /* 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);
-
-       if (hw->ampdu_queues) {
-               /* create a new queue for this aggregation */
-               ret = ieee80211_ht_agg_queue_add(local, sta, tid);
-
-               /* case no queue is available to aggregation
-                * don't switch to aggregation */
-               if (ret) {
-#ifdef CONFIG_MAC80211_HT_DEBUG
-                       printk(KERN_DEBUG "BA request denied - "
-                              "queue unavailable for tid %d\n", tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-                       goto err_unlock_queue;
-               }
-       }
-       sdata = sta->sdata;
-
-       /* 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;
-
-       /* This is slightly racy because the queue isn't stopped */
-       start_seq_num = sta->tid_seq[tid];
-
-       if (local->ops->ampdu_action)
-               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
-                                              &sta->sta, tid, &start_seq_num);
-
-       if (ret) {
-               /* No need to requeue the packets in the agg queue, since we
-                * held the tx lock: no packet could be enqueued to the newly
-                * allocated queue */
-               if (hw->ampdu_queues)
-                       ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
-#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_unlock_queue;
-       }
-
-       /* Will put all the packets in the new SW queue */
-       if (hw->ampdu_queues)
-               ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
-       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 exit;
-
-err_unlock_queue:
-       kfree(sta->ampdu_mlme.tid_tx[tid]);
-       sta->ampdu_mlme.tid_tx[tid] = NULL;
-       ret = -EBUSY;
-err_unlock_sta:
-       spin_unlock_bh(&sta->lock);
-exit:
-       rcu_read_unlock();
-       return ret;
-}
-EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
-
-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;
-       u8 *state;
-       int ret = 0;
-
-       if (tid >= STA_TID_NUM)
-               return -EINVAL;
-
-       rcu_read_lock();
-       sta = sta_info_get(local, ra);
-       if (!sta) {
-               rcu_read_unlock();
-               return -ENOENT;
-       }
-
-       /* 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 stop_BA_exit;
-       }
-
-#ifdef CONFIG_MAC80211_HT_DEBUG
-       printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
-              ra, tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-
-       if (hw->ampdu_queues)
-               ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
-
-       *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
-               (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
-
-       if (local->ops->ampdu_action)
-               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
-                                              &sta->sta, tid, NULL);
-
-       /* case HW denied going back to legacy */
-       if (ret) {
-               WARN_ON(ret != -EBUSY);
-               *state = HT_AGG_STATE_OPERATIONAL;
-               if (hw->ampdu_queues)
-                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
-               goto stop_BA_exit;
-       }
-
-stop_BA_exit:
-       spin_unlock_bh(&sta->lock);
-       rcu_read_unlock();
-       return ret;
-}
-EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
-
-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 (!(*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;
-       }
-
-       WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
-
-       *state |= HT_ADDBA_DRV_READY_MSK;
-
-       if (*state == HT_AGG_STATE_OPERATIONAL) {
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
-#endif
-               if (hw->ampdu_queues)
-                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
-       }
-       spin_unlock_bh(&sta->lock);
-       rcu_read_unlock();
-}
-EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
-
-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;
-       int agg_queue;
-
-       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);
-
-       if (hw->ampdu_queues) {
-               agg_queue = sta->tid_to_tx_q[tid];
-               ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
-
-               /* We just requeued the all the frames that were in the
-                * removed queue, and since we might miss a softirq we do
-                * netif_schedule_queue.  ieee80211_wake_queue is not used
-                * here as this queue is not necessarily stopped
-                */
-               netif_schedule_queue(netdev_get_tx_queue(local->mdev,
-                                                        agg_queue));
-       }
-       spin_lock_bh(&sta->lock);
-       *state = HT_AGG_STATE_IDLE;
-       sta->ampdu_mlme.addba_req_num[tid] = 0;
-       kfree(sta->ampdu_mlme.tid_tx[tid]);
-       sta->ampdu_mlme.tid_tx[tid] = NULL;
-       spin_unlock_bh(&sta->lock);
-
-       rcu_read_unlock();
-}
-EXPORT_SYMBOL(ieee80211_stop_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);
-
-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);
-
-/*
- * After accepting the AddBA Request we activated a timer,
- * resetting it after each frame that arrives from the originator.
- * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
- */
-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_HT_DEBUG
-       printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
-#endif
-       ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
-                                        (u16)*ptid, WLAN_BACK_TIMER,
-                                        WLAN_REASON_QSTA_TIMEOUT);
-}
-
-void ieee80211_process_addba_request(struct ieee80211_local *local,
-                                    struct sta_info *sta,
-                                    struct ieee80211_mgmt *mgmt,
-                                    size_t len)
-{
-       struct ieee80211_hw *hw = &local->hw;
-       struct ieee80211_conf *conf = &hw->conf;
-       struct tid_ampdu_rx *tid_agg_rx;
-       u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
-       u8 dialog_token;
-       int ret = -EOPNOTSUPP;
-
-       /* 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;
-
-       /* 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;
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               if (net_ratelimit())
-                       printk(KERN_DEBUG "AddBA Req with bad params from "
-                               "%pM on tid %u. policy %d, buffer size %d\n",
-                               mgmt->sa, tid, ba_policy,
-                               buf_size);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-               goto end_no_lock;
-       }
-       /* determine default buffer size */
-       if (buf_size == 0) {
-               struct ieee80211_supported_band *sband;
-
-               sband = local->hw.wiphy->bands[conf->channel->band];
-               buf_size = IEEE80211_MIN_AMPDU_BUF;
-               buf_size = buf_size << sband->ht_cap.ampdu_factor;
-       }
-
-
-       /* examine state machine */
-       spin_lock_bh(&sta->lock);
-
-       if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               if (net_ratelimit())
-                       printk(KERN_DEBUG "unexpected AddBA Req from "
-                               "%pM on tid %u\n",
-                               mgmt->sa, tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-               goto end;
-       }
-
-       /* prepare A-MPDU MLME for Rx aggregation */
-       sta->ampdu_mlme.tid_rx[tid] =
-                       kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
-       if (!sta->ampdu_mlme.tid_rx[tid]) {
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               if (net_ratelimit())
-                       printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
-                                       tid);
-#endif
-               goto end;
-       }
-       /* rx timer */
-       sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
-                               sta_rx_agg_session_timer_expired;
-       sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
-                               (unsigned long)&sta->timer_to_tid[tid];
-       init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
-
-       tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
-
-       /* prepare reordering buffer */
-       tid_agg_rx->reorder_buf =
-               kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
-       if (!tid_agg_rx->reorder_buf) {
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               if (net_ratelimit())
-                       printk(KERN_ERR "can not allocate reordering buffer "
-                              "to tid %d\n", tid);
-#endif
-               kfree(sta->ampdu_mlme.tid_rx[tid]);
-               goto end;
-       }
-
-       if (local->ops->ampdu_action)
-               ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
-                                              &sta->sta, tid, &start_seq_num);
-#ifdef CONFIG_MAC80211_HT_DEBUG
-       printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-
-       if (ret) {
-               kfree(tid_agg_rx->reorder_buf);
-               kfree(tid_agg_rx);
-               sta->ampdu_mlme.tid_rx[tid] = NULL;
-               goto end;
-       }
-
-       /* change state and send addba resp */
-       sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
-       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;
-end:
-       spin_unlock_bh(&sta->lock);
-
-end_no_lock:
-       ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
-                                 dialog_token, status, 1, buf_size, timeout);
-}
-
-void ieee80211_process_addba_resp(struct ieee80211_local *local,
-                                 struct sta_info *sta,
-                                 struct ieee80211_mgmt *mgmt,
-                                 size_t len)
-{
-       struct ieee80211_hw *hw = &local->hw;
-       u16 capab;
-       u16 tid, start_seq_num;
-       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) {
-               *state |= HT_ADDBA_RECEIVED_MSK;
-               sta->ampdu_mlme.addba_req_num[tid] = 0;
-
-               if (*state == HT_AGG_STATE_OPERATIONAL &&
-                   local->hw.ampdu_queues)
-                       ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
-
-               if (local->ops->ampdu_action) {
-                       (void)local->ops->ampdu_action(hw,
-                                              IEEE80211_AMPDU_TX_RESUME,
-                                              &sta->sta, tid, &start_seq_num);
-               }
-#ifdef CONFIG_MAC80211_HT_DEBUG
-               printk(KERN_DEBUG "Resuming TX aggregation for tid %d\n", tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-               spin_unlock_bh(&sta->lock);
-       } else {
-               sta->ampdu_mlme.addba_req_num[tid]++;
-               /* this will allow the state check in stop_BA_session */
-               *state = HT_AGG_STATE_OPERATIONAL;
-               spin_unlock_bh(&sta->lock);
-               ieee80211_stop_tx_ba_session(hw, sta->sta.addr, tid,
-                                            WLAN_BACK_INITIATOR);
-       }
-}
-
 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
                             struct sta_info *sta,
                             struct ieee80211_mgmt *mgmt, size_t len)
index 5b23001..6987dfa 100644 (file)
@@ -987,6 +987,9 @@ u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
                        struct ieee80211_ht_info *hti,
                        u16 ap_ht_cap_flags);
 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn);
+void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
+                         const u8 *da, u16 tid,
+                         u16 initiator, u16 reason_code);
 
 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *da,
                                u16 tid, u16 initiator, u16 reason);