| /* |
| * 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 2007-2010, 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. |
| */ |
| |
| /** |
| * DOC: RX A-MPDU aggregation |
| * |
| * Aggregation on the RX side requires only implementing the |
| * @ampdu_action callback that is invoked to start/stop any |
| * block-ack sessions for RX aggregation. |
| * |
| * When RX aggregation is started by the peer, the driver is |
| * notified via @ampdu_action function, with the |
| * %IEEE80211_AMPDU_RX_START action, and may reject the request |
| * in which case a negative response is sent to the peer, if it |
| * accepts it a positive response is sent. |
| * |
| * While the session is active, the device/driver are required |
| * to de-aggregate frames and pass them up one by one to mac80211, |
| * which will handle the reorder buffer. |
| * |
| * When the aggregation session is stopped again by the peer or |
| * ourselves, the driver's @ampdu_action function will be called |
| * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the |
| * call must not fail. |
| */ |
| |
| #include <linux/ieee80211.h> |
| #include <linux/slab.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| |
| static void ieee80211_free_tid_rx(struct rcu_head *h) |
| { |
| struct tid_ampdu_rx *tid_rx = |
| container_of(h, struct tid_ampdu_rx, rcu_head); |
| int i; |
| |
| for (i = 0; i < tid_rx->buf_size; i++) |
| dev_kfree_skb(tid_rx->reorder_buf[i]); |
| kfree(tid_rx->reorder_buf); |
| kfree(tid_rx->reorder_time); |
| kfree(tid_rx); |
| } |
| |
| void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
| u16 initiator, u16 reason, bool tx) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct tid_ampdu_rx *tid_rx; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| tid_rx = sta->ampdu_mlme.tid_rx[tid]; |
| |
| if (!tid_rx) |
| return; |
| |
| rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL); |
| |
| #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 (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP, |
| &sta->sta, tid, NULL)) |
| printk(KERN_DEBUG "HW problem - can not stop rx " |
| "aggregation for tid %d\n", tid); |
| |
| /* check if this is a self generated aggregation halt */ |
| if (initiator == WLAN_BACK_RECIPIENT && tx) |
| ieee80211_send_delba(sta->sdata, sta->sta.addr, |
| tid, 0, reason); |
| |
| del_timer_sync(&tid_rx->session_timer); |
| del_timer_sync(&tid_rx->reorder_timer); |
| |
| call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); |
| } |
| |
| void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
| u16 initiator, u16 reason, bool tx) |
| { |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| } |
| |
| /* |
| * After accepting the AddBA Request we activated a timer, |
| * resetting it after each frame that arrives from the originator. |
| */ |
| 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 |
| set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired); |
| ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
| } |
| |
| static void sta_rx_agg_reorder_timer_expired(unsigned long data) |
| { |
| 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]); |
| |
| rcu_read_lock(); |
| ieee80211_release_reorder_timeout(sta, *ptid); |
| rcu_read_unlock(); |
| } |
| |
| 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->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->vif.addr, ETH_ALEN); |
| if (sdata->vif.type == NL80211_IFTYPE_AP || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| memcpy(mgmt->bssid, sdata->vif.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); |
| } |
| |
| 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_BLOCK_BA)) { |
| #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; |
| } |
| |
| /* make sure the size doesn't exceed the maximum supported by the hw */ |
| if (buf_size > local->hw.max_rx_aggregation_subframes) |
| buf_size = local->hw.max_rx_aggregation_subframes; |
| |
| /* examine state machine */ |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| |
| if (sta->ampdu_mlme.tid_rx[tid]) { |
| #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 */ |
| tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL); |
| if (!tid_agg_rx) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_ERR "allocate rx mlme to tid %d failed\n", |
| tid); |
| #endif |
| goto end; |
| } |
| |
| spin_lock_init(&tid_agg_rx->reorder_lock); |
| |
| /* rx timer */ |
| tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired; |
| tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| init_timer(&tid_agg_rx->session_timer); |
| |
| /* rx reorder timer */ |
| tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired; |
| tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid]; |
| init_timer(&tid_agg_rx->reorder_timer); |
| |
| /* prepare reordering buffer */ |
| tid_agg_rx->reorder_buf = |
| kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL); |
| tid_agg_rx->reorder_time = |
| kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); |
| if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_ERR "can not allocate reordering buffer " |
| "to tid %d\n", tid); |
| #endif |
| kfree(tid_agg_rx->reorder_buf); |
| kfree(tid_agg_rx->reorder_time); |
| kfree(tid_agg_rx); |
| goto end; |
| } |
| |
| ret = drv_ampdu_action(local, sta->sdata, 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->reorder_time); |
| kfree(tid_agg_rx); |
| goto end; |
| } |
| |
| /* update data */ |
| 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; |
| |
| /* activate it for RX */ |
| rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); |
| |
| if (timeout) |
| mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); |
| |
| end: |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| |
| end_no_lock: |
| ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, |
| dialog_token, status, 1, buf_size, timeout); |
| } |