summaryrefslogtreecommitdiffstats
path: root/net/mac80211/ht.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mac80211/ht.c')
-rw-r--r--net/mac80211/ht.c992
1 files changed, 992 insertions, 0 deletions
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
new file mode 100644
index 00000000000..dc7d9a3d70d
--- /dev/null
+++ b/net/mac80211/ht.c
@@ -0,0 +1,992 @@
+/*
+ * 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/wireless.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "sta_info.h"
+#include "wme.h"
+
+int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
+ struct ieee80211_ht_info *ht_info)
+{
+
+ if (ht_info == NULL)
+ return -EINVAL;
+
+ memset(ht_info, 0, sizeof(*ht_info));
+
+ if (ht_cap_ie) {
+ u8 ampdu_info = ht_cap_ie->ampdu_params_info;
+
+ ht_info->ht_supported = 1;
+ ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
+ ht_info->ampdu_factor =
+ ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
+ ht_info->ampdu_density =
+ (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
+ memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
+ } else
+ ht_info->ht_supported = 0;
+
+ return 0;
+}
+
+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)
+{
+ if (bss_info == NULL)
+ return -EINVAL;
+
+ memset(bss_info, 0, sizeof(*bss_info));
+
+ if (ht_add_info_ie) {
+ u16 op_mode;
+ op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
+
+ bss_info->primary_channel = ht_add_info_ie->control_chan;
+ bss_info->bss_cap = ht_add_info_ie->ht_param;
+ bss_info->bss_op_mode = (u8)(op_mode & 0xff);
+ }
+
+ return 0;
+}
+
+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, 0);
+}
+
+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, 0);
+}
+
+static 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;
+ struct sk_buff *skb;
+ struct ieee80211_mgmt *mgmt;
+ u16 params;
+
+ skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
+
+ if (!skb) {
+ printk(KERN_ERR "%s: failed to allocate buffer "
+ "for delba 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.delba));
+
+ mgmt->u.action.category = WLAN_CATEGORY_BACK;
+ mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
+ params = (u16)(initiator << 11); /* bit 11 initiator */
+ params |= (u16)(tid << 12); /* bit 15:12 TID number */
+
+ mgmt->u.action.u.delba.params = cpu_to_le16(params);
+ mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
+
+ ieee80211_tx_skb(sdata, skb, 0);
+}
+
+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;
+ DECLARE_MAC_BUF(mac);
+
+ 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 %s tid %u\n",
+ print_mac(mac, 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;
+ 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 */
+
+ 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);
+
+ /* 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 */
+ 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 */
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ 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 %s tid %u\n",
+ print_mac(mac, ra), tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+ 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;
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ 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: %s\n",
+ print_mac(mac, 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
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ 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 %s tid %d\n",
+ print_mac(mac, 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: %s\n",
+ print_mac(mac, 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);
+
+ 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;
+ DECLARE_MAC_BUF(mac);
+
+ /* 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 */
+ if (((ba_policy != 1)
+ && (!(conf->ht_conf.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 "
+ "%s on tid %u. policy %d, buffer size %d\n",
+ print_mac(mac, 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_info.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 "
+ "%s on tid %u\n",
+ print_mac(mac, 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 =
+ kmalloc(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;
+ }
+ memset(tid_agg_rx->reorder_buf, 0,
+ buf_size * sizeof(struct sk_buff *));
+
+ 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;
+ 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)
+ ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
+
+ 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)
+{
+ struct ieee80211_local *local = sdata->local;
+ u16 tid, params;
+ u16 initiator;
+ DECLARE_MAC_BUF(mac);
+
+ params = le16_to_cpu(mgmt->u.action.u.delba.params);
+ tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
+ initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ if (net_ratelimit())
+ printk(KERN_DEBUG "delba from %s (%s) tid %d reason code %d\n",
+ print_mac(mac, mgmt->sa),
+ initiator ? "initiator" : "recipient", tid,
+ mgmt->u.action.u.delba.reason_code);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
+ if (initiator == WLAN_BACK_INITIATOR)
+ ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
+ WLAN_BACK_INITIATOR, 0);
+ else { /* WLAN_BACK_RECIPIENT */
+ spin_lock_bh(&sta->lock);
+ sta->ampdu_mlme.tid_state_tx[tid] =
+ HT_AGG_STATE_OPERATIONAL;
+ spin_unlock_bh(&sta->lock);
+ ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
+ WLAN_BACK_RECIPIENT);
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-11 11:55:52 +0000