8abd3f9bc4
We can only support aggregation on AP/STA right now. HT isn't defined for IBSS, WDS or MESH. In the WDS/MESH cases it's not clear what to put into the IBSS field, and we don't handle that in the code at all. Also fix the code to handle VLAN correctly. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
289 lines
9.1 KiB
C
289 lines
9.1 KiB
C
/*
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* HT handling
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2007-2008, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ieee80211.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
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u16 initiator, u16 reason)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_hw *hw = &local->hw;
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struct sta_info *sta;
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int ret, i;
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rcu_read_lock();
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sta = sta_info_get(local, ra);
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if (!sta) {
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rcu_read_unlock();
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return;
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}
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/* check if TID is in operational state */
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spin_lock_bh(&sta->lock);
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if (sta->ampdu_mlme.tid_state_rx[tid]
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!= HT_AGG_STATE_OPERATIONAL) {
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spin_unlock_bh(&sta->lock);
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rcu_read_unlock();
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return;
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}
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sta->ampdu_mlme.tid_state_rx[tid] =
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HT_AGG_STATE_REQ_STOP_BA_MSK |
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(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
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spin_unlock_bh(&sta->lock);
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/* stop HW Rx aggregation. ampdu_action existence
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* already verified in session init so we add the BUG_ON */
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BUG_ON(!local->ops->ampdu_action);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
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ra, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
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&sta->sta, tid, NULL);
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if (ret)
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printk(KERN_DEBUG "HW problem - can not stop rx "
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"aggregation for tid %d\n", tid);
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/* shutdown timer has not expired */
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if (initiator != WLAN_BACK_TIMER)
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del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
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/* check if this is a self generated aggregation halt */
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if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
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ieee80211_send_delba(sdata, ra, tid, 0, reason);
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/* free the reordering buffer */
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for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
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if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
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/* release the reordered frames */
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dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
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sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
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sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
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}
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}
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/* free resources */
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kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
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kfree(sta->ampdu_mlme.tid_rx[tid]);
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sta->ampdu_mlme.tid_rx[tid] = NULL;
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sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
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rcu_read_unlock();
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}
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/*
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* After accepting the AddBA Request we activated a timer,
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* resetting it after each frame that arrives from the originator.
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* if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
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*/
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static void sta_rx_agg_session_timer_expired(unsigned long data)
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{
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/* not an elegant detour, but there is no choice as the timer passes
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* only one argument, and various sta_info are needed here, so init
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* flow in sta_info_create gives the TID as data, while the timer_to_id
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* array gives the sta through container_of */
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u8 *ptid = (u8 *)data;
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u8 *timer_to_id = ptid - *ptid;
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struct sta_info *sta = container_of(timer_to_id, struct sta_info,
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timer_to_tid[0]);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
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#endif
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ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
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(u16)*ptid, WLAN_BACK_TIMER,
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WLAN_REASON_QSTA_TIMEOUT);
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}
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static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
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u8 dialog_token, u16 status, u16 policy,
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u16 buf_size, u16 timeout)
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{
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struct ieee80211_if_sta *ifsta = &sdata->u.sta;
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_mgmt *mgmt;
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u16 capab;
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skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
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if (!skb) {
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printk(KERN_DEBUG "%s: failed to allocate buffer "
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"for addba resp frame\n", sdata->dev->name);
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return;
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}
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skb_reserve(skb, local->hw.extra_tx_headroom);
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mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
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memset(mgmt, 0, 24);
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memcpy(mgmt->da, da, ETH_ALEN);
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memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
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else
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memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
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mgmt->u.action.category = WLAN_CATEGORY_BACK;
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mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
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mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
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capab = (u16)(policy << 1); /* bit 1 aggregation policy */
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capab |= (u16)(tid << 2); /* bit 5:2 TID number */
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capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
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mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
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mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
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mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
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ieee80211_tx_skb(sdata, skb, 1);
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}
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void ieee80211_process_addba_request(struct ieee80211_local *local,
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struct sta_info *sta,
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struct ieee80211_mgmt *mgmt,
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size_t len)
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{
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struct ieee80211_hw *hw = &local->hw;
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struct ieee80211_conf *conf = &hw->conf;
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struct tid_ampdu_rx *tid_agg_rx;
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u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
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u8 dialog_token;
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int ret = -EOPNOTSUPP;
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/* extract session parameters from addba request frame */
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dialog_token = mgmt->u.action.u.addba_req.dialog_token;
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timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
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start_seq_num =
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le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
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capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
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ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
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tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
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buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
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status = WLAN_STATUS_REQUEST_DECLINED;
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/* sanity check for incoming parameters:
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* check if configuration can support the BA policy
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* and if buffer size does not exceeds max value */
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/* XXX: check own ht delayed BA capability?? */
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if (((ba_policy != 1)
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&& (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
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|| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
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status = WLAN_STATUS_INVALID_QOS_PARAM;
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "AddBA Req with bad params from "
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"%pM on tid %u. policy %d, buffer size %d\n",
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mgmt->sa, tid, ba_policy,
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buf_size);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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goto end_no_lock;
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}
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/* determine default buffer size */
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if (buf_size == 0) {
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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[conf->channel->band];
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buf_size = IEEE80211_MIN_AMPDU_BUF;
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buf_size = buf_size << sband->ht_cap.ampdu_factor;
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}
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/* examine state machine */
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spin_lock_bh(&sta->lock);
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if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "unexpected AddBA Req from "
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"%pM on tid %u\n",
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mgmt->sa, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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goto end;
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}
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/* prepare A-MPDU MLME for Rx aggregation */
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sta->ampdu_mlme.tid_rx[tid] =
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kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
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if (!sta->ampdu_mlme.tid_rx[tid]) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
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tid);
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#endif
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goto end;
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}
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/* rx timer */
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sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
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sta_rx_agg_session_timer_expired;
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sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
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(unsigned long)&sta->timer_to_tid[tid];
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init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
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tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
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/* prepare reordering buffer */
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tid_agg_rx->reorder_buf =
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kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
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if (!tid_agg_rx->reorder_buf) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_ERR "can not allocate reordering buffer "
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"to tid %d\n", tid);
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#endif
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kfree(sta->ampdu_mlme.tid_rx[tid]);
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goto end;
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}
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if (local->ops->ampdu_action)
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ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
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&sta->sta, tid, &start_seq_num);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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if (ret) {
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kfree(tid_agg_rx->reorder_buf);
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kfree(tid_agg_rx);
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sta->ampdu_mlme.tid_rx[tid] = NULL;
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goto end;
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}
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/* change state and send addba resp */
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sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
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tid_agg_rx->dialog_token = dialog_token;
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tid_agg_rx->ssn = start_seq_num;
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tid_agg_rx->head_seq_num = start_seq_num;
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tid_agg_rx->buf_size = buf_size;
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tid_agg_rx->timeout = timeout;
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tid_agg_rx->stored_mpdu_num = 0;
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status = WLAN_STATUS_SUCCESS;
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end:
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spin_unlock_bh(&sta->lock);
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end_no_lock:
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ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
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dialog_token, status, 1, buf_size, timeout);
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}
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