| /* |
| * 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 |
| * Copyright(c) 2015-2017 Intel Deutschland GmbH |
| * Copyright (C) 2018 - 2019 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 <linux/slab.h> |
| #include <linux/export.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "wme.h" |
| |
| /** |
| * DOC: TX A-MPDU aggregation |
| * |
| * Aggregation on the TX side requires setting the hardware flag |
| * %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
| * packets with a flag indicating A-MPDU aggregation. The driver |
| * or device is responsible for actually aggregating the frames, |
| * as well as deciding how many and which to aggregate. |
| * |
| * When TX aggregation is started by some subsystem (usually the rate |
| * control algorithm would be appropriate) by calling the |
| * ieee80211_start_tx_ba_session() function, the driver will be |
| * notified via its @ampdu_action function, with the |
| * %IEEE80211_AMPDU_TX_START action. |
| * |
| * In response to that, the driver is later required to call the |
| * ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
| * start the aggregation session after the peer has also responded. |
| * If the peer responds negatively, the session will be stopped |
| * again right away. Note that it is possible for the aggregation |
| * session to be stopped before the driver has indicated that it |
| * is done setting it up, in which case it must not indicate the |
| * setup completion. |
| * |
| * Also note that, since we also need to wait for a response from |
| * the peer, the driver is notified of the completion of the |
| * handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the |
| * @ampdu_action callback. |
| * |
| * Similarly, when the aggregation session is stopped by the peer |
| * or something calling ieee80211_stop_tx_ba_session(), the driver's |
| * @ampdu_action function will be called with the action |
| * %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, |
| * and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). |
| * Note that the sta can get destroyed before the BA tear down is |
| * complete. |
| */ |
| |
| 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 sk_buff *skb; |
| struct ieee80211_mgmt *mgmt; |
| u16 capab; |
| |
| skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| |
| if (!skb) |
| return; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| mgmt = skb_put_zero(skb, 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 || |
| sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
| 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); |
| else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| memcpy(mgmt->bssid, sdata->u.ibss.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 << 0); /* bit 0 A-MSDU support */ |
| 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); |
| } |
| |
| void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 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) |
| return; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| bar = skb_put_zero(skb, 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->vif.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 << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
| bar->control = cpu_to_le16(bar_control); |
| bar->start_seq_num = cpu_to_le16(ssn); |
| |
| IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
| IEEE80211_TX_CTL_REQ_TX_STATUS; |
| ieee80211_tx_skb_tid(sdata, skb, tid); |
| } |
| EXPORT_SYMBOL(ieee80211_send_bar); |
| |
| void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
| struct tid_ampdu_tx *tid_tx) |
| { |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| lockdep_assert_held(&sta->lock); |
| rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
| } |
| |
| /* |
| * When multiple aggregation sessions on multiple stations |
| * are being created/destroyed simultaneously, we need to |
| * refcount the global queue stop caused by that in order |
| * to not get into a situation where one of the aggregation |
| * setup or teardown re-enables queues before the other is |
| * ready to handle that. |
| * |
| * These two functions take care of this issue by keeping |
| * a global "agg_queue_stop" refcount. |
| */ |
| static void __acquires(agg_queue) |
| ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| { |
| int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| |
| /* we do refcounting here, so don't use the queue reason refcounting */ |
| |
| if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
| ieee80211_stop_queue_by_reason( |
| &sdata->local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| false); |
| __acquire(agg_queue); |
| } |
| |
| static void __releases(agg_queue) |
| ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
| { |
| int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| |
| if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) |
| ieee80211_wake_queue_by_reason( |
| &sdata->local->hw, queue, |
| IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
| false); |
| __release(agg_queue); |
| } |
| |
| static void |
| ieee80211_agg_stop_txq(struct sta_info *sta, int tid) |
| { |
| struct ieee80211_txq *txq = sta->sta.txq[tid]; |
| struct ieee80211_sub_if_data *sdata; |
| struct fq *fq; |
| struct txq_info *txqi; |
| |
| if (!txq) |
| return; |
| |
| txqi = to_txq_info(txq); |
| sdata = vif_to_sdata(txq->vif); |
| fq = &sdata->local->fq; |
| |
| /* Lock here to protect against further seqno updates on dequeue */ |
| spin_lock_bh(&fq->lock); |
| set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
| spin_unlock_bh(&fq->lock); |
| } |
| |
| static void |
| ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) |
| { |
| struct ieee80211_txq *txq = sta->sta.txq[tid]; |
| struct txq_info *txqi; |
| |
| if (!txq) |
| return; |
| |
| txqi = to_txq_info(txq); |
| |
| if (enable) |
| set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
| else |
| clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
| |
| clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
| local_bh_disable(); |
| rcu_read_lock(); |
| drv_wake_tx_queue(sta->sdata->local, txqi); |
| rcu_read_unlock(); |
| local_bh_enable(); |
| } |
| |
| /* |
| * splice packets from the STA's pending to the local pending, |
| * requires a call to ieee80211_agg_splice_finish later |
| */ |
| static void __acquires(agg_queue) |
| ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, |
| struct tid_ampdu_tx *tid_tx, u16 tid) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
| unsigned long flags; |
| |
| ieee80211_stop_queue_agg(sdata, tid); |
| |
| if (WARN(!tid_tx, |
| "TID %d gone but expected when splicing aggregates from the pending queue\n", |
| tid)) |
| return; |
| |
| if (!skb_queue_empty(&tid_tx->pending)) { |
| spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
| /* copy over remaining packets */ |
| skb_queue_splice_tail_init(&tid_tx->pending, |
| &local->pending[queue]); |
| spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
| } |
| } |
| |
| static void __releases(agg_queue) |
| ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) |
| { |
| ieee80211_wake_queue_agg(sdata, tid); |
| } |
| |
| static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| lockdep_assert_held(&sta->lock); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| /* |
| * When we get here, the TX path will not be lockless any more wrt. |
| * aggregation, since the OPERATIONAL bit has long been cleared. |
| * Thus it will block on getting the lock, if it occurs. So if we |
| * stop the queue now, we will not get any more packets, and any |
| * that might be being processed will wait for us here, thereby |
| * guaranteeing that no packets go to the tid_tx pending queue any |
| * more. |
| */ |
| |
| ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
| |
| /* future packets must not find the tid_tx struct any more */ |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| |
| ieee80211_agg_splice_finish(sta->sdata, tid); |
| ieee80211_agg_start_txq(sta, tid, false); |
| |
| kfree_rcu(tid_tx, rcu_head); |
| } |
| |
| int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| enum ieee80211_agg_stop_reason reason) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct tid_ampdu_tx *tid_tx; |
| struct ieee80211_ampdu_params params = { |
| .sta = &sta->sta, |
| .tid = tid, |
| .buf_size = 0, |
| .amsdu = false, |
| .timeout = 0, |
| .ssn = 0, |
| }; |
| int ret; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| switch (reason) { |
| case AGG_STOP_DECLINED: |
| case AGG_STOP_LOCAL_REQUEST: |
| case AGG_STOP_PEER_REQUEST: |
| params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
| break; |
| case AGG_STOP_DESTROY_STA: |
| params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return -EINVAL; |
| } |
| |
| spin_lock_bh(&sta->lock); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| if (!tid_tx) { |
| spin_unlock_bh(&sta->lock); |
| return -ENOENT; |
| } |
| |
| /* |
| * if we're already stopping ignore any new requests to stop |
| * unless we're destroying it in which case notify the driver |
| */ |
| if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| spin_unlock_bh(&sta->lock); |
| if (reason != AGG_STOP_DESTROY_STA) |
| return -EALREADY; |
| params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
| ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| WARN_ON_ONCE(ret); |
| return 0; |
| } |
| |
| if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
| /* not even started yet! */ |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| spin_unlock_bh(&sta->lock); |
| kfree_rcu(tid_tx, rcu_head); |
| return 0; |
| } |
| |
| set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
| |
| ieee80211_agg_stop_txq(sta, tid); |
| |
| spin_unlock_bh(&sta->lock); |
| |
| ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
| sta->sta.addr, tid); |
| |
| del_timer_sync(&tid_tx->addba_resp_timer); |
| del_timer_sync(&tid_tx->session_timer); |
| |
| /* |
| * After this packets are no longer handed right through |
| * to the driver but are put onto tid_tx->pending instead, |
| * with locking to ensure proper access. |
| */ |
| clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| |
| /* |
| * There might be a few packets being processed right now (on |
| * another CPU) that have already gotten past the aggregation |
| * check when it was still OPERATIONAL and consequently have |
| * IEEE80211_TX_CTL_AMPDU set. In that case, this code might |
| * call into the driver at the same time or even before the |
| * TX paths calls into it, which could confuse the driver. |
| * |
| * Wait for all currently running TX paths to finish before |
| * telling the driver. New packets will not go through since |
| * the aggregation session is no longer OPERATIONAL. |
| */ |
| synchronize_net(); |
| |
| tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
| WLAN_BACK_RECIPIENT : |
| WLAN_BACK_INITIATOR; |
| tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; |
| |
| ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
| |
| /* HW shall not deny going back to legacy */ |
| if (WARN_ON(ret)) { |
| /* |
| * We may have pending packets get stuck in this case... |
| * Not bothering with a workaround for now. |
| */ |
| } |
| |
| /* |
| * In the case of AGG_STOP_DESTROY_STA, the driver won't |
| * necessarily call ieee80211_stop_tx_ba_cb(), so this may |
| * seem like we can leave the tid_tx data pending forever. |
| * This is true, in a way, but "forever" is only until the |
| * station struct is actually destroyed. In the meantime, |
| * leaving it around ensures that we don't transmit packets |
| * to the driver on this TID which might confuse it. |
| */ |
| |
| return 0; |
| } |
| |
| /* |
| * 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 *sta = container_of((void *)data, |
| struct sta_info, timer_to_tid[tid]); |
| struct tid_ampdu_tx *tid_tx; |
| |
| /* check if the TID waits for addBA response */ |
| rcu_read_lock(); |
| tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); |
| if (!tid_tx || |
| test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
| rcu_read_unlock(); |
| ht_dbg(sta->sdata, |
| "timer expired on %pM tid %d not expecting addBA response\n", |
| sta->sta.addr, tid); |
| return; |
| } |
| |
| ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| ieee80211_stop_tx_ba_session(&sta->sta, tid); |
| rcu_read_unlock(); |
| } |
| |
| void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_ampdu_params params = { |
| .sta = &sta->sta, |
| .action = IEEE80211_AMPDU_TX_START, |
| .tid = tid, |
| .buf_size = 0, |
| .amsdu = false, |
| .timeout = 0, |
| }; |
| int ret; |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| /* |
| * Start queuing up packets for this aggregation session. |
| * We're going to release them once the driver is OK with |
| * that. |
| */ |
| clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| |
| ieee80211_agg_stop_txq(sta, tid); |
| |
| /* |
| * Make sure no packets are being processed. This ensures that |
| * we have a valid starting sequence number and that in-flight |
| * packets have been flushed out and no packets for this TID |
| * will go into the driver during the ampdu_action call. |
| */ |
| synchronize_net(); |
| |
| params.ssn = sta->tid_seq[tid] >> 4; |
| ret = drv_ampdu_action(local, sdata, ¶ms); |
| if (ret) { |
| ht_dbg(sdata, |
| "BA request denied - HW unavailable for %pM tid %d\n", |
| sta->sta.addr, tid); |
| spin_lock_bh(&sta->lock); |
| ieee80211_agg_splice_packets(sdata, tid_tx, tid); |
| ieee80211_assign_tid_tx(sta, tid, NULL); |
| ieee80211_agg_splice_finish(sdata, tid); |
| spin_unlock_bh(&sta->lock); |
| |
| ieee80211_agg_start_txq(sta, tid, false); |
| |
| kfree_rcu(tid_tx, rcu_head); |
| return; |
| } |
| |
| /* activate the timer for the recipient's addBA response */ |
| mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); |
| ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| spin_lock_bh(&sta->lock); |
| sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
| sta->ampdu_mlme.addba_req_num[tid]++; |
| spin_unlock_bh(&sta->lock); |
| |
| /* send AddBA request */ |
| ieee80211_send_addba_request(sdata, sta->sta.addr, tid, |
| tid_tx->dialog_token, params.ssn, |
| IEEE80211_MAX_AMPDU_BUF, |
| tid_tx->timeout); |
| } |
| |
| /* |
| * After accepting the AddBA Response we activated a timer, |
| * resetting it after each frame that we send. |
| */ |
| static void sta_tx_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]); |
| struct tid_ampdu_tx *tid_tx; |
| unsigned long timeout; |
| |
| rcu_read_lock(); |
| tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]); |
| if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout); |
| if (time_is_after_jiffies(timeout)) { |
| mod_timer(&tid_tx->session_timer, timeout); |
| rcu_read_unlock(); |
| return; |
| } |
| |
| rcu_read_unlock(); |
| |
| ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
| sta->sta.addr, (u16)*ptid); |
| |
| ieee80211_stop_tx_ba_session(&sta->sta, *ptid); |
| } |
| |
| int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, |
| u16 timeout) |
| { |
| struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct tid_ampdu_tx *tid_tx; |
| int ret = 0; |
| |
| trace_api_start_tx_ba_session(pubsta, tid); |
| |
| if (WARN(sta->reserved_tid == tid, |
| "Requested to start BA session on reserved tid=%d", tid)) |
| return -EINVAL; |
| |
| if (!pubsta->ht_cap.ht_supported) |
| return -EINVAL; |
| |
| if (WARN_ON_ONCE(!local->ops->ampdu_action)) |
| return -EINVAL; |
| |
| if ((tid >= IEEE80211_NUM_TIDS) || |
| !ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) || |
| ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) |
| return -EINVAL; |
| |
| if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID)) |
| return -EINVAL; |
| |
| ht_dbg(sdata, "Open BA session requested for %pM tid %u\n", |
| pubsta->addr, tid); |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
| sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| sdata->vif.type != NL80211_IFTYPE_AP && |
| sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| return -EINVAL; |
| |
| if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
| ht_dbg(sdata, |
| "BA sessions blocked - Denying BA session request %pM tid %d\n", |
| sta->sta.addr, tid); |
| return -EINVAL; |
| } |
| |
| /* |
| * 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a |
| * member of an IBSS, and has no other existing Block Ack agreement |
| * with the recipient STA, then the initiating STA shall transmit a |
| * Probe Request frame to the recipient STA and shall not transmit an |
| * ADDBA Request frame unless it receives a Probe Response frame |
| * from the recipient within dot11ADDBAFailureTimeout. |
| * |
| * The probe request mechanism for ADDBA is currently not implemented, |
| * but we only build up Block Ack session with HT STAs. This information |
| * is set when we receive a bss info from a probe response or a beacon. |
| */ |
| if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC && |
| !sta->sta.ht_cap.ht_supported) { |
| ht_dbg(sdata, |
| "BA request denied - IBSS STA %pM does not advertise HT support\n", |
| pubsta->addr); |
| return -EINVAL; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * if we have tried more than HT_AGG_BURST_RETRIES times we |
| * will spread our requests in time to avoid stalling connection |
| * for too long |
| */ |
| if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES && |
| time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] + |
| HT_AGG_RETRIES_PERIOD)) { |
| ht_dbg(sdata, |
| "BA request denied - %d failed requests on %pM tid %u\n", |
| sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid); |
| ret = -EBUSY; |
| goto err_unlock_sta; |
| } |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| /* check if the TID is not in aggregation flow already */ |
| if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { |
| ht_dbg(sdata, |
| "BA request denied - session is not idle on %pM tid %u\n", |
| sta->sta.addr, tid); |
| ret = -EAGAIN; |
| goto err_unlock_sta; |
| } |
| |
| /* prepare A-MPDU MLME for Tx aggregation */ |
| tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC); |
| if (!tid_tx) { |
| ret = -ENOMEM; |
| goto err_unlock_sta; |
| } |
| |
| skb_queue_head_init(&tid_tx->pending); |
| __set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state); |
| |
| tid_tx->timeout = timeout; |
| |
| /* response timer */ |
| setup_timer(&tid_tx->addba_resp_timer, |
| sta_addba_resp_timer_expired, |
| (unsigned long)&sta->timer_to_tid[tid]); |
| |
| /* tx timer */ |
| setup_deferrable_timer(&tid_tx->session_timer, |
| sta_tx_agg_session_timer_expired, |
| (unsigned long)&sta->timer_to_tid[tid]); |
| |
| /* assign a dialog token */ |
| sta->ampdu_mlme.dialog_token_allocator++; |
| tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; |
| |
| /* |
| * Finally, assign it to the start array; the work item will |
| * collect it and move it to the normal array. |
| */ |
| sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; |
| |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| |
| /* this flow continues off the work */ |
| err_unlock_sta: |
| spin_unlock_bh(&sta->lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_session); |
| |
| static void ieee80211_agg_tx_operational(struct ieee80211_local *local, |
| struct sta_info *sta, u16 tid) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| struct ieee80211_ampdu_params params = { |
| .sta = &sta->sta, |
| .action = IEEE80211_AMPDU_TX_OPERATIONAL, |
| .tid = tid, |
| .timeout = 0, |
| .ssn = 0, |
| }; |
| |
| lockdep_assert_held(&sta->ampdu_mlme.mtx); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| params.buf_size = tid_tx->buf_size; |
| params.amsdu = tid_tx->amsdu; |
| |
| ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| drv_ampdu_action(local, sta->sdata, ¶ms); |
| |
| /* |
| * synchronize with TX path, while splicing the TX path |
| * should block so it won't put more packets onto pending. |
| */ |
| spin_lock_bh(&sta->lock); |
| |
| ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
| /* |
| * Now mark as operational. This will be visible |
| * in the TX path, and lets it go lock-free in |
| * the common case. |
| */ |
| set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
| ieee80211_agg_splice_finish(sta->sdata, tid); |
| |
| spin_unlock_bh(&sta->lock); |
| |
| ieee80211_agg_start_txq(sta, tid, true); |
| } |
| |
| void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid, |
| struct tid_ampdu_tx *tid_tx) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| |
| if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))) |
| return; |
| |
| if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) |
| ieee80211_agg_tx_operational(local, sta, tid); |
| } |
| |
| static struct tid_ampdu_tx * |
| ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata, |
| const u8 *ra, u16 tid, struct sta_info **sta) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| |
| if (tid >= IEEE80211_NUM_TIDS) { |
| ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n", |
| tid, IEEE80211_NUM_TIDS); |
| return NULL; |
| } |
| |
| *sta = sta_info_get_bss(sdata, ra); |
| if (!*sta) { |
| ht_dbg(sdata, "Could not find station: %pM\n", ra); |
| return NULL; |
| } |
| |
| tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]); |
| |
| if (WARN_ON(!tid_tx)) |
| ht_dbg(sdata, "addBA was not requested!\n"); |
| |
| return tid_tx; |
| } |
| |
| void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct tid_ampdu_tx *tid_tx; |
| |
| trace_api_start_tx_ba_cb(sdata, ra, tid); |
| |
| rcu_read_lock(); |
| tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); |
| if (!tid_tx) |
| goto out; |
| |
| set_bit(HT_AGG_STATE_START_CB, &tid_tx->state); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| out: |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe); |
| |
| int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
| enum ieee80211_agg_stop_reason reason) |
| { |
| int ret; |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| |
| ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason); |
| |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| |
| return ret; |
| } |
| |
| int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid) |
| { |
| struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| struct tid_ampdu_tx *tid_tx; |
| int ret = 0; |
| |
| trace_api_stop_tx_ba_session(pubsta, tid); |
| |
| if (!local->ops->ampdu_action) |
| return -EINVAL; |
| |
| if (tid >= IEEE80211_NUM_TIDS) |
| return -EINVAL; |
| |
| spin_lock_bh(&sta->lock); |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| |
| if (!tid_tx) { |
| ret = -ENOENT; |
| goto unlock; |
| } |
| |
| WARN(sta->reserved_tid == tid, |
| "Requested to stop BA session on reserved tid=%d", tid); |
| |
| if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| /* already in progress stopping it */ |
| ret = 0; |
| goto unlock; |
| } |
| |
| set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| |
| unlock: |
| spin_unlock_bh(&sta->lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_session); |
| |
| void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid, |
| struct tid_ampdu_tx *tid_tx) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| bool send_delba = false; |
| |
| ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| spin_lock_bh(&sta->lock); |
| |
| if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| ht_dbg(sdata, |
| "unexpected callback to A-MPDU stop for %pM tid %d\n", |
| sta->sta.addr, tid); |
| goto unlock_sta; |
| } |
| |
| if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop) |
| send_delba = true; |
| |
| ieee80211_remove_tid_tx(sta, tid); |
| |
| unlock_sta: |
| spin_unlock_bh(&sta->lock); |
| |
| if (send_delba) |
| ieee80211_send_delba(sdata, sta->sta.addr, tid, |
| WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE); |
| } |
| |
| void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif, |
| const u8 *ra, u16 tid) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct tid_ampdu_tx *tid_tx; |
| |
| trace_api_stop_tx_ba_cb(sdata, ra, tid); |
| |
| rcu_read_lock(); |
| tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta); |
| if (!tid_tx) |
| goto out; |
| |
| set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state); |
| ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
| out: |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe); |
| |
| |
| void ieee80211_process_addba_resp(struct ieee80211_local *local, |
| struct sta_info *sta, |
| struct ieee80211_mgmt *mgmt, |
| size_t len) |
| { |
| struct tid_ampdu_tx *tid_tx; |
| struct ieee80211_txq *txq; |
| u16 capab, tid; |
| u8 buf_size; |
| bool amsdu; |
| |
| capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
| amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
| tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; |
| buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; |
| buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes); |
| |
| txq = sta->sta.txq[tid]; |
| if (!amsdu && txq) |
| set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags); |
| |
| mutex_lock(&sta->ampdu_mlme.mtx); |
| |
| tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
| if (!tid_tx) |
| goto out; |
| |
| if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) { |
| ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n", |
| sta->sta.addr, tid); |
| goto out; |
| } |
| |
| del_timer_sync(&tid_tx->addba_resp_timer); |
| |
| ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n", |
| sta->sta.addr, tid); |
| |
| /* |
| * addba_resp_timer may have fired before we got here, and |
| * caused WANT_STOP to be set. If the stop then was already |
| * processed further, STOPPING might be set. |
| */ |
| if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) || |
| test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
| ht_dbg(sta->sdata, |
| "got addBA resp for %pM tid %d but we already gave up\n", |
| sta->sta.addr, tid); |
| goto out; |
| } |
| |
| /* |
| * IEEE 802.11-2007 7.3.1.14: |
| * In an ADDBA Response frame, when the Status Code field |
| * is set to 0, the Buffer Size subfield is set to a value |
| * of at least 1. |
| */ |
| if (le16_to_cpu(mgmt->u.action.u.addba_resp.status) |
| == WLAN_STATUS_SUCCESS && buf_size) { |
| if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED, |
| &tid_tx->state)) { |
| /* ignore duplicate response */ |
| goto out; |
| } |
| |
| tid_tx->buf_size = buf_size; |
| tid_tx->amsdu = amsdu; |
| |
| if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)) |
| ieee80211_agg_tx_operational(local, sta, tid); |
| |
| sta->ampdu_mlme.addba_req_num[tid] = 0; |
| |
| tid_tx->timeout = |
| le16_to_cpu(mgmt->u.action.u.addba_resp.timeout); |
| |
| if (tid_tx->timeout) { |
| mod_timer(&tid_tx->session_timer, |
| TU_TO_EXP_TIME(tid_tx->timeout)); |
| tid_tx->last_tx = jiffies; |
| } |
| |
| } else { |
| ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED); |
| } |
| |
| out: |
| mutex_unlock(&sta->ampdu_mlme.mtx); |
| } |