This patch adds the following abilities to mac80211:
- start A-MPDU Tx session
- stop A-MPDU Tx session
- call backs to start/stop A-MPDU Tx session
- sending addBA request
- processing addBA response
Signed-off-by: Ron Rindjunsky <ron.rindjunsky@xxxxxxxxx>
---
net/mac80211/ieee80211.c | 336 ++++++++++++++++++++++++++++++++++++++++++
net/mac80211/ieee80211_i.h | 14 ++
net/mac80211/ieee80211_sta.c | 178 ++++++++++++++++++++++
3 files changed, 528 insertions(+), 0 deletions(-)
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index 5093a1a..4140489 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -406,6 +406,329 @@ static int ieee80211_stop(struct net_device *dev)
return 0;
}
+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 = 0;
+ u8 *state;
+ int ret;
+ DECLARE_MAC_BUF(mac);
+
+ if (tid >= STA_TID_NUM)
+ return -EINVAL;
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
+ print_mac(mac, ra), tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+ sta = sta_info_get(local, ra);
+ if (!sta) {
+ printk(KERN_DEBUG "Could not find the station\n");
+ return -ENOENT;
+ }
+
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+
+ /* we have tried too many times, receiver does not want A-MPDU */
+ if (sta->ampdu_mlme.tid_tx[tid].addba_req_num > HT_AGG_MAX_RETRIES) {
+ ret = -EBUSY;
+ goto start_ba_exit;
+ }
+
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+ /* 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 start_ba_exit;
+ }
+
+ /* FIXME: need a better way to ensure that TX flow won't interrupt us*/
+ /* until the end of the call to requeue function */
+ spin_lock_bh(&local->mdev->queue_lock);
+
+ /* 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 - no queue available for"
+ " tid %d\n", tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ spin_unlock_bh(&local->mdev->queue_lock);
+ goto start_ba_exit;
+ }
+ sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+
+ /* 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;
+
+ if (local->ops->ampdu_action)
+ ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
+ ra, 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 */
+ ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "BA request denied - HW or queue unavailable"
+ " for tid %d\n", tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ spin_unlock_bh(&local->mdev->queue_lock);
+ *state = HT_AGG_STATE_IDLE;
+ goto start_ba_exit;
+ }
+
+ /* Will put all the packets in the new SW queue */
+ ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
+ spin_unlock_bh(&local->mdev->queue_lock);
+
+ /* We have most probably almost emptied the legacy queue */
+ ieee80211_wake_queue(local_to_hw(local), ieee802_1d_to_ac[tid]);
+
+ /* 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->dev, 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);
+ printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
+
+start_ba_exit:
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ sta_info_put(sta);
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ if (tid >= STA_TID_NUM)
+ return -EINVAL;
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "Stop a BA session requested for %s tid %u\n",
+ print_mac(mac, ra), tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+ sta = sta_info_get(local, ra);
+ if (!sta)
+ return -ENOENT;
+
+ /* check if the TID is in aggregation */
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+
+ if (*state != HT_AGG_STATE_OPERATIONAL) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "Try to stop Tx aggregation on"
+ " non active TID\n");
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ ret = -ENOENT;
+ goto stop_BA_exit;
+ }
+
+ 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,
+ ra, tid, NULL);
+
+ /* case HW denied going back to legacy */
+ if (ret) {
+ WARN_ON(ret != -EBUSY);
+ *state = HT_AGG_STATE_OPERATIONAL;
+ ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+ goto stop_BA_exit;
+ }
+
+stop_BA_exit:
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ sta_info_put(sta);
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ if (tid >= STA_TID_NUM) {
+ printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
+ tid, STA_TID_NUM);
+ return;
+ }
+
+ sta = sta_info_get(local, ra);
+ if (!sta) {
+ printk(KERN_DEBUG "Could not find station: %s\n",
+ print_mac(mac, ra));
+ return;
+ }
+
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+
+ if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
+ printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
+ *state);
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ sta_info_put(sta);
+ return;
+ }
+
+ WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
+
+ *state |= HT_ADDBA_DRV_READY_MSK;
+
+ if (*state == HT_AGG_STATE_OPERATIONAL) {
+ printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
+ ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+ }
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ sta_info_put(sta);
+}
+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;
+ DECLARE_MAC_BUF(mac);
+
+ if (tid >= STA_TID_NUM) {
+ printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
+ tid, STA_TID_NUM);
+ return;
+ }
+
+ printk(KERN_DEBUG "Stop a BA session requested on DA %s tid %d\n",
+ print_mac(mac, ra), tid);
+
+ sta = sta_info_get(local, ra);
+ if (!sta) {
+ printk(KERN_DEBUG "Could not find station: %s\n",
+ print_mac(mac, ra));
+ return;
+ }
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+ if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
+ printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
+ sta_info_put(sta);
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ return;
+ }
+
+ if (*state & HT_AGG_STATE_INITIATOR_MSK)
+ ieee80211_send_delba(sta->dev, ra, tid,
+ WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
+
+ agg_queue = sta->tid_to_tx_q[tid];
+
+ /* avoid ordering issues: we are the only one that can modify
+ * the content of the qdiscs */
+ spin_lock_bh(&local->mdev->queue_lock);
+ /* remove the queue for this aggregation */
+ ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
+ spin_unlock_bh(&local->mdev->queue_lock);
+
+ /* we just requeued the all the frames that were in the removed
+ * queue, and since we might miss a softirq we do netif_schedule.
+ * ieee80211_wake_queue is not used here as this queue is not
+ * necessarily stopped */
+ netif_schedule(local->mdev);
+ *state = HT_AGG_STATE_IDLE;
+ sta->ampdu_mlme.tid_tx[tid].addba_req_num = 0;
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+
+ sta_info_put(sta);
+}
+EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
+
+void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
+ 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)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s: Not enough memory, "
+ "dropping start BA session", skb->dev->name);
+ 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,
+ 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)) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "%s: Not enough memory, "
+ "dropping stop BA session", skb->dev->name);
+ 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);
+
static void ieee80211_set_multicast_list(struct net_device *dev)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
@@ -700,6 +1023,7 @@ static void ieee80211_tasklet_handler(unsigned long data)
struct sk_buff *skb;
struct ieee80211_rx_status rx_status;
struct ieee80211_tx_status *tx_status;
+ struct ieee80211_ra_tid *ra_tid;
while ((skb = skb_dequeue(&local->skb_queue)) ||
(skb = skb_dequeue(&local->skb_queue_unreliable))) {
@@ -720,6 +1044,18 @@ static void ieee80211_tasklet_handler(unsigned long data)
skb, tx_status);
kfree(tx_status);
break;
+ case IEEE80211_DELBA_MSG:
+ ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
+ ieee80211_stop_tx_ba_cb(local_to_hw(local),
+ ra_tid->ra, ra_tid->tid);
+ dev_kfree_skb(skb);
+ break;
+ case IEEE80211_ADDBA_MSG:
+ ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
+ ieee80211_start_tx_ba_cb(local_to_hw(local),
+ ra_tid->ra, ra_tid->tid);
+ dev_kfree_skb(skb);
+ break ;
default: /* should never get here! */
printk(KERN_ERR "%s: Unknown message type (%d)\n",
wiphy_name(local->hw.wiphy), skb->pkt_type);
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 383d8d0..9b478f8 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -403,6 +403,8 @@ struct ieee80211_sub_if_data *vif_to_sdata(struct ieee80211_vif *p)
enum {
IEEE80211_RX_MSG = 1,
IEEE80211_TX_STATUS_MSG = 2,
+ IEEE80211_DELBA_MSG = 3,
+ IEEE80211_ADDBA_MSG = 4,
};
struct ieee80211_local {
@@ -622,6 +624,12 @@ struct ieee80211_local {
#endif
};
+/* this struct represents 802.11n's RA/TID combination */
+struct ieee80211_ra_tid {
+ u8 ra[ETH_ALEN];
+ u16 tid;
+};
+
static inline struct ieee80211_local *hw_to_local(
struct ieee80211_hw *hw)
{
@@ -776,9 +784,15 @@ int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
int ieee80211_ht_addt_info_ie_to_ht_bss_info(
struct ieee80211_ht_addt_info *ht_add_info_ie,
struct ieee80211_ht_bss_info *bss_info);
+void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
+ u16 tid, u8 dialog_token, u16 start_seq_num,
+ u16 agg_size, u16 timeout);
+void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
+ u16 initiator, u16 reason_code);
void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *da,
u16 tid, u16 initiator, u16 reason);
void sta_rx_agg_session_timer_expired(unsigned long data);
+void sta_addba_resp_timer_expired(unsigned long data);
/* ieee80211_iface.c */
int ieee80211_if_add(struct net_device *dev, const char *name,
struct net_device **new_dev, int type);
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index ec62938..ab548f1 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -1050,6 +1050,58 @@ static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
return;
}
+void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
+ u16 tid, u8 dialog_token, u16 start_seq_num,
+ u16 agg_size, u16 timeout)
+{
+ struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+ struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ 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 + 1 +
+ sizeof(mgmt->u.action.u.addba_req));
+
+
+ if (!skb) {
+ printk(KERN_ERR "%s: failed to allocate buffer "
+ "for addba request frame\n", 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, dev->dev_addr, ETH_ALEN);
+ if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
+ memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
+ else
+ memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
+
+ mgmt->frame_control = IEEE80211_FC(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_sta_tx(dev, skb, 0);
+}
+
static void ieee80211_sta_process_addba_request(struct net_device *dev,
struct ieee80211_mgmt *mgmt,
size_t len)
@@ -1160,6 +1212,78 @@ end_no_lock:
sta_info_put(sta);
}
+static void ieee80211_sta_process_addba_resp(struct net_device *dev,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+ struct ieee80211_hw *hw = &local->hw;
+ struct sta_info *sta;
+ u16 capab;
+ u16 tid;
+ u8 *state;
+
+ sta = sta_info_get(local, mgmt->sa);
+ if (!sta)
+ return;
+
+ capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
+ tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
+
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+
+ if (mgmt->u.action.u.addba_resp.dialog_token !=
+ sta->ampdu_mlme.tid_tx[tid].dialog_token) {
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ sta_info_put(sta);
+ 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) {
+ if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
+ "%d\n", *state);
+ sta_info_put(sta);
+ return;
+ }
+
+ if (*state & HT_ADDBA_RECEIVED_MSK)
+ printk(KERN_DEBUG "double addBA response\n");
+
+ *state |= HT_ADDBA_RECEIVED_MSK;
+ sta->ampdu_mlme.tid_tx[tid].addba_req_num = 0;
+
+ if (*state == HT_AGG_STATE_OPERATIONAL) {
+ printk(KERN_DEBUG "Aggregation on for tid %d \n", tid);
+ ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+ }
+
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ printk(KERN_DEBUG "recipient accepted agg: tid %d \n", tid);
+ } else {
+ printk(KERN_DEBUG "recipient rejected agg: tid %d \n", tid);
+
+ sta->ampdu_mlme.tid_tx[tid].addba_req_num++;
+ /* this will allow the state check in stop_BA_session */
+ *state = HT_AGG_STATE_OPERATIONAL;
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
+ WLAN_BACK_INITIATOR);
+ }
+ sta_info_put(sta);
+}
+
void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
u16 initiator, u16 reason_code)
{
@@ -1266,6 +1390,7 @@ void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
sta_info_put(sta);
}
+
static void ieee80211_sta_process_delba(struct net_device *dev,
struct ieee80211_mgmt *mgmt, size_t len)
{
@@ -1297,6 +1422,53 @@ static void ieee80211_sta_process_delba(struct net_device *dev,
}
/*
+ * 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.
+ */
+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_add gives the TID as data, while the timer_to_id
+ * array gives the sta through container_of */
+ u16 tid = *(int *)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;
+
+ sta = sta_info_get(local, temp_sta->addr);
+ if (!sta)
+ return;
+
+ state = &sta->ampdu_mlme.tid_tx[tid].state;
+ /* check if the TID waits for addBA response */
+ spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
+ if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ *state = HT_AGG_STATE_IDLE;
+ printk(KERN_DEBUG "timer expired on tid %d but we are not "
+ "expecting addBA response there", tid);
+ goto timer_expired_exit;
+ }
+
+ printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
+
+ /* go through the state check in stop_BA_session */
+ *state = HT_AGG_STATE_OPERATIONAL;
+ spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
+ ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
+ WLAN_BACK_INITIATOR);
+
+timer_expired_exit:
+ sta_info_put(sta);
+}
+
+/*
* After receiving Block Ack Request (BAR) we activated a
* timer after each frame arrives from the originator.
* if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
@@ -2236,6 +2408,12 @@ static void ieee80211_rx_mgmt_action(struct net_device *dev,
break;
ieee80211_sta_process_addba_request(dev, mgmt, len);
break;
+ case WLAN_ACTION_ADDBA_RESP:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.addba_resp)))
+ break;
+ ieee80211_sta_process_addba_resp(dev, mgmt, len);
+ break;
case WLAN_ACTION_DELBA:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.delba)))
--
1.5.3.3
-
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