| /* |
| * 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, |
| ra, 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->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->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, |
| 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 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, |
| 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->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->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->addr, 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->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->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->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->addr, tid, |
| WLAN_BACK_RECIPIENT); |
| } |
| } |