diff options
Diffstat (limited to 'net/mac80211/agg-rx.c')
-rw-r--r-- | net/mac80211/agg-rx.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c new file mode 100644 index 0000000..07656d8 --- /dev/null +++ b/net/mac80211/agg-rx.c @@ -0,0 +1,310 @@ +/* + * HT handling + * + * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> + * Copyright 2002-2005, Instant802 Networks, Inc. + * Copyright 2005-2006, Devicescape Software, Inc. + * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> + * Copyright 2007, Michael Wu <flamingice@sourmilk.net> + * Copyright 2007-2008, Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/ieee80211.h> +#include <net/mac80211.h> +#include "ieee80211_i.h" + +void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, + u16 initiator, u16 reason) +{ + struct ieee80211_local *local = sta->local; + struct ieee80211_hw *hw = &local->hw; + int i; + + /* 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); + 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); + +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", + sta->sta.addr, tid); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + + if (local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP, + &sta->sta, tid, NULL)) + 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(sta->sdata, sta->sta.addr, + 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; + } + } + + spin_lock_bh(&sta->lock); + /* free resources */ + kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); + + if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { + 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; + spin_unlock_bh(&sta->lock); +} + +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 sta_info *sta; + + /* stop HW Rx aggregation. ampdu_action existence + * already verified in session init so we add the BUG_ON */ + BUG_ON(!local->ops->ampdu_action); + + rcu_read_lock(); + + sta = sta_info_get(local, ra); + if (!sta) { + rcu_read_unlock(); + return; + } + + __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); + + rcu_read_unlock(); +} + +/* + * After accepting the AddBA Request we activated a timer, + * resetting it after each frame that arrives from the originator. + * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. + */ +static void sta_rx_agg_session_timer_expired(unsigned long data) +{ + /* not an elegant detour, but there is no choice as the timer passes + * only one argument, and various sta_info are needed here, so init + * flow in sta_info_create gives the TID as data, while the timer_to_id + * array gives the sta through container_of */ + u8 *ptid = (u8 *)data; + u8 *timer_to_id = ptid - *ptid; + struct sta_info *sta = container_of(timer_to_id, struct sta_info, + timer_to_tid[0]); + +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); +#endif + ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, + (u16)*ptid, WLAN_BACK_TIMER, + WLAN_REASON_QSTA_TIMEOUT); +} + +static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, + u8 dialog_token, u16 status, u16 policy, + u16 buf_size, u16 timeout) +{ + struct ieee80211_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 || + sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); + else if (sdata->vif.type == NL80211_IFTYPE_STATION) + memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); + + mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | + IEEE80211_STYPE_ACTION); + + skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); + mgmt->u.action.category = WLAN_CATEGORY_BACK; + mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; + mgmt->u.action.u.addba_resp.dialog_token = dialog_token; + + capab = (u16)(policy << 1); /* bit 1 aggregation policy */ + capab |= (u16)(tid << 2); /* bit 5:2 TID number */ + capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ + + mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); + mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); + mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); + + ieee80211_tx_skb(sdata, skb, 1); +} + +void ieee80211_process_addba_request(struct ieee80211_local *local, + struct sta_info *sta, + struct ieee80211_mgmt *mgmt, + size_t len) +{ + struct ieee80211_hw *hw = &local->hw; + struct ieee80211_conf *conf = &hw->conf; + struct tid_ampdu_rx *tid_agg_rx; + u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; + u8 dialog_token; + int ret = -EOPNOTSUPP; + + /* extract session parameters from addba request frame */ + dialog_token = mgmt->u.action.u.addba_req.dialog_token; + timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); + start_seq_num = + le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; + + capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); + ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; + tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; + buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; + + status = WLAN_STATUS_REQUEST_DECLINED; + + if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "Suspend in progress. " + "Denying ADDBA request\n"); +#endif + goto end_no_lock; + } + + /* sanity check for incoming parameters: + * check if configuration can support the BA policy + * and if buffer size does not exceeds max value */ + /* XXX: check own ht delayed BA capability?? */ + if (((ba_policy != 1) + && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) + || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { + status = WLAN_STATUS_INVALID_QOS_PARAM; +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_DEBUG "AddBA Req with bad params from " + "%pM on tid %u. policy %d, buffer size %d\n", + mgmt->sa, tid, ba_policy, + buf_size); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + goto end_no_lock; + } + /* determine default buffer size */ + if (buf_size == 0) { + struct ieee80211_supported_band *sband; + + sband = local->hw.wiphy->bands[conf->channel->band]; + buf_size = IEEE80211_MIN_AMPDU_BUF; + buf_size = buf_size << sband->ht_cap.ampdu_factor; + } + + + /* examine state machine */ + spin_lock_bh(&sta->lock); + + if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_DEBUG "unexpected AddBA Req from " + "%pM on tid %u\n", + mgmt->sa, tid); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + goto end; + } + + /* prepare A-MPDU MLME for Rx aggregation */ + sta->ampdu_mlme.tid_rx[tid] = + kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); + if (!sta->ampdu_mlme.tid_rx[tid]) { +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_ERR "allocate rx mlme to tid %d failed\n", + tid); +#endif + goto end; + } + /* rx timer */ + sta->ampdu_mlme.tid_rx[tid]->session_timer.function = + sta_rx_agg_session_timer_expired; + sta->ampdu_mlme.tid_rx[tid]->session_timer.data = + (unsigned long)&sta->timer_to_tid[tid]; + init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); + + tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; + + /* prepare reordering buffer */ + tid_agg_rx->reorder_buf = + kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); + if (!tid_agg_rx->reorder_buf) { +#ifdef CONFIG_MAC80211_HT_DEBUG + if (net_ratelimit()) + printk(KERN_ERR "can not allocate reordering buffer " + "to tid %d\n", tid); +#endif + kfree(sta->ampdu_mlme.tid_rx[tid]); + goto end; + } + + if (local->ops->ampdu_action) + ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START, + &sta->sta, tid, &start_seq_num); +#ifdef CONFIG_MAC80211_HT_DEBUG + printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); +#endif /* CONFIG_MAC80211_HT_DEBUG */ + + if (ret) { + kfree(tid_agg_rx->reorder_buf); + kfree(tid_agg_rx); + sta->ampdu_mlme.tid_rx[tid] = NULL; + goto end; + } + + /* change state and send addba resp */ + sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; + tid_agg_rx->dialog_token = dialog_token; + tid_agg_rx->ssn = start_seq_num; + tid_agg_rx->head_seq_num = start_seq_num; + tid_agg_rx->buf_size = buf_size; + tid_agg_rx->timeout = timeout; + tid_agg_rx->stored_mpdu_num = 0; + status = WLAN_STATUS_SUCCESS; +end: + spin_unlock_bh(&sta->lock); + +end_no_lock: + ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, + dialog_token, status, 1, buf_size, timeout); +} |