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1028 lines
29 KiB
1028 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HT handling |
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* |
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* Copyright 2003, Jouni Malinen <[email protected]> |
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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 <[email protected]> |
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* Copyright 2007, Michael Wu <[email protected]> |
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* Copyright 2007-2010, Intel Corporation |
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* Copyright(c) 2015-2017 Intel Deutschland GmbH |
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* Copyright (C) 2018 - 2020 Intel Corporation |
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*/ |
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|
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#include <linux/ieee80211.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <net/mac80211.h> |
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#include "ieee80211_i.h" |
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#include "driver-ops.h" |
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#include "wme.h" |
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|
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/** |
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* DOC: TX A-MPDU aggregation |
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* |
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* Aggregation on the TX side requires setting the hardware flag |
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* %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed |
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* packets with a flag indicating A-MPDU aggregation. The driver |
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* or device is responsible for actually aggregating the frames, |
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* as well as deciding how many and which to aggregate. |
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* |
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* When TX aggregation is started by some subsystem (usually the rate |
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* control algorithm would be appropriate) by calling the |
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* ieee80211_start_tx_ba_session() function, the driver will be |
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* notified via its @ampdu_action function, with the |
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* %IEEE80211_AMPDU_TX_START action. |
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* |
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* In response to that, the driver is later required to call the |
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* ieee80211_start_tx_ba_cb_irqsafe() function, which will really |
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* start the aggregation session after the peer has also responded. |
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* If the peer responds negatively, the session will be stopped |
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* again right away. Note that it is possible for the aggregation |
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* session to be stopped before the driver has indicated that it |
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* is done setting it up, in which case it must not indicate the |
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* setup completion. |
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* |
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* Also note that, since we also need to wait for a response from |
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* the peer, the driver is notified of the completion of the |
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* handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the |
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* @ampdu_action callback. |
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* |
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* Similarly, when the aggregation session is stopped by the peer |
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* or something calling ieee80211_stop_tx_ba_session(), the driver's |
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* @ampdu_action function will be called with the action |
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* %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail, |
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* and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe(). |
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* Note that the sta can get destroyed before the BA tear down is |
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* complete. |
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*/ |
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|
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static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, |
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const u8 *da, u16 tid, |
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u8 dialog_token, u16 start_seq_num, |
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u16 agg_size, u16 timeout) |
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{ |
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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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|
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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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return; |
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skb_reserve(skb, local->hw.extra_tx_headroom); |
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mgmt = skb_put_zero(skb, 24); |
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memcpy(mgmt->da, da, ETH_ALEN); |
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memcpy(mgmt->sa, sdata->vif.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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sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
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else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
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memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
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else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
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memcpy(mgmt->bssid, sdata->u.ibss.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_req)); |
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mgmt->u.action.category = WLAN_CATEGORY_BACK; |
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mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
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mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
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capab = IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
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capab |= IEEE80211_ADDBA_PARAM_POLICY_MASK; |
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capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK); |
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capab |= u16_encode_bits(agg_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); |
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mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
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mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
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mgmt->u.action.u.addba_req.start_seq_num = |
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cpu_to_le16(start_seq_num << 4); |
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|
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ieee80211_tx_skb(sdata, skb); |
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} |
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|
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void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn) |
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{ |
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
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struct ieee80211_local *local = sdata->local; |
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struct sk_buff *skb; |
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struct ieee80211_bar *bar; |
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u16 bar_control = 0; |
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skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
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if (!skb) |
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return; |
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skb_reserve(skb, local->hw.extra_tx_headroom); |
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bar = skb_put_zero(skb, sizeof(*bar)); |
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bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
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IEEE80211_STYPE_BACK_REQ); |
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memcpy(bar->ra, ra, ETH_ALEN); |
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memcpy(bar->ta, sdata->vif.addr, ETH_ALEN); |
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bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
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bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
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bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT); |
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bar->control = cpu_to_le16(bar_control); |
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bar->start_seq_num = cpu_to_le16(ssn); |
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IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | |
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IEEE80211_TX_CTL_REQ_TX_STATUS; |
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ieee80211_tx_skb_tid(sdata, skb, tid); |
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} |
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EXPORT_SYMBOL(ieee80211_send_bar); |
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|
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void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, |
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struct tid_ampdu_tx *tid_tx) |
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{ |
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lockdep_assert_held(&sta->ampdu_mlme.mtx); |
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lockdep_assert_held(&sta->lock); |
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rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); |
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} |
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|
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/* |
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* When multiple aggregation sessions on multiple stations |
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* are being created/destroyed simultaneously, we need to |
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* refcount the global queue stop caused by that in order |
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* to not get into a situation where one of the aggregation |
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* setup or teardown re-enables queues before the other is |
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* ready to handle that. |
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* |
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* These two functions take care of this issue by keeping |
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* a global "agg_queue_stop" refcount. |
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*/ |
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static void __acquires(agg_queue) |
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ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
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{ |
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int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
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|
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/* we do refcounting here, so don't use the queue reason refcounting */ |
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if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1) |
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ieee80211_stop_queue_by_reason( |
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&sdata->local->hw, queue, |
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IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
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false); |
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__acquire(agg_queue); |
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} |
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static void __releases(agg_queue) |
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ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid) |
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{ |
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int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
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|
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if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0) |
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ieee80211_wake_queue_by_reason( |
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&sdata->local->hw, queue, |
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IEEE80211_QUEUE_STOP_REASON_AGGREGATION, |
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false); |
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__release(agg_queue); |
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} |
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|
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static void |
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ieee80211_agg_stop_txq(struct sta_info *sta, int tid) |
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{ |
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struct ieee80211_txq *txq = sta->sta.txq[tid]; |
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struct ieee80211_sub_if_data *sdata; |
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struct fq *fq; |
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struct txq_info *txqi; |
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if (!txq) |
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return; |
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txqi = to_txq_info(txq); |
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sdata = vif_to_sdata(txq->vif); |
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fq = &sdata->local->fq; |
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|
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/* Lock here to protect against further seqno updates on dequeue */ |
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spin_lock_bh(&fq->lock); |
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set_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
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spin_unlock_bh(&fq->lock); |
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} |
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|
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static void |
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ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable) |
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{ |
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struct ieee80211_txq *txq = sta->sta.txq[tid]; |
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struct txq_info *txqi; |
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if (!txq) |
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return; |
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txqi = to_txq_info(txq); |
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if (enable) |
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set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
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else |
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clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags); |
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clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); |
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local_bh_disable(); |
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rcu_read_lock(); |
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schedule_and_wake_txq(sta->sdata->local, txqi); |
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rcu_read_unlock(); |
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local_bh_enable(); |
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} |
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|
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/* |
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* splice packets from the STA's pending to the local pending, |
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* requires a call to ieee80211_agg_splice_finish later |
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*/ |
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static void __acquires(agg_queue) |
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ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata, |
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struct tid_ampdu_tx *tid_tx, u16 tid) |
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{ |
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struct ieee80211_local *local = sdata->local; |
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int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)]; |
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unsigned long flags; |
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ieee80211_stop_queue_agg(sdata, tid); |
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|
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if (WARN(!tid_tx, |
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"TID %d gone but expected when splicing aggregates from the pending queue\n", |
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tid)) |
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return; |
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if (!skb_queue_empty(&tid_tx->pending)) { |
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spin_lock_irqsave(&local->queue_stop_reason_lock, flags); |
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/* copy over remaining packets */ |
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skb_queue_splice_tail_init(&tid_tx->pending, |
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&local->pending[queue]); |
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spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); |
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} |
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} |
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static void __releases(agg_queue) |
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ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid) |
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{ |
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ieee80211_wake_queue_agg(sdata, tid); |
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} |
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static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid) |
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{ |
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struct tid_ampdu_tx *tid_tx; |
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lockdep_assert_held(&sta->ampdu_mlme.mtx); |
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lockdep_assert_held(&sta->lock); |
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
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|
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/* |
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* When we get here, the TX path will not be lockless any more wrt. |
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* aggregation, since the OPERATIONAL bit has long been cleared. |
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* Thus it will block on getting the lock, if it occurs. So if we |
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* stop the queue now, we will not get any more packets, and any |
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* that might be being processed will wait for us here, thereby |
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* guaranteeing that no packets go to the tid_tx pending queue any |
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* more. |
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*/ |
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ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid); |
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|
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/* future packets must not find the tid_tx struct any more */ |
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ieee80211_assign_tid_tx(sta, tid, NULL); |
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ieee80211_agg_splice_finish(sta->sdata, tid); |
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ieee80211_agg_start_txq(sta, tid, false); |
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kfree_rcu(tid_tx, rcu_head); |
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} |
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int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, |
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enum ieee80211_agg_stop_reason reason) |
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{ |
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struct ieee80211_local *local = sta->local; |
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struct tid_ampdu_tx *tid_tx; |
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struct ieee80211_ampdu_params params = { |
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.sta = &sta->sta, |
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.tid = tid, |
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.buf_size = 0, |
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.amsdu = false, |
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.timeout = 0, |
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.ssn = 0, |
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}; |
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int ret; |
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lockdep_assert_held(&sta->ampdu_mlme.mtx); |
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switch (reason) { |
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case AGG_STOP_DECLINED: |
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case AGG_STOP_LOCAL_REQUEST: |
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case AGG_STOP_PEER_REQUEST: |
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params.action = IEEE80211_AMPDU_TX_STOP_CONT; |
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break; |
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case AGG_STOP_DESTROY_STA: |
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params.action = IEEE80211_AMPDU_TX_STOP_FLUSH; |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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return -EINVAL; |
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} |
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spin_lock_bh(&sta->lock); |
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|
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/* free struct pending for start, if present */ |
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tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; |
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kfree(tid_tx); |
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sta->ampdu_mlme.tid_start_tx[tid] = NULL; |
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
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if (!tid_tx) { |
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spin_unlock_bh(&sta->lock); |
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return -ENOENT; |
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} |
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|
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/* |
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* if we're already stopping ignore any new requests to stop |
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* unless we're destroying it in which case notify the driver |
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*/ |
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if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
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spin_unlock_bh(&sta->lock); |
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if (reason != AGG_STOP_DESTROY_STA) |
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return -EALREADY; |
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params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT; |
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ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
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WARN_ON_ONCE(ret); |
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return 0; |
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} |
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if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { |
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/* not even started yet! */ |
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ieee80211_assign_tid_tx(sta, tid, NULL); |
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spin_unlock_bh(&sta->lock); |
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kfree_rcu(tid_tx, rcu_head); |
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return 0; |
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} |
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set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state); |
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ieee80211_agg_stop_txq(sta, tid); |
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|
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spin_unlock_bh(&sta->lock); |
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ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n", |
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sta->sta.addr, tid); |
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del_timer_sync(&tid_tx->addba_resp_timer); |
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del_timer_sync(&tid_tx->session_timer); |
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|
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/* |
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* After this packets are no longer handed right through |
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* to the driver but are put onto tid_tx->pending instead, |
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* with locking to ensure proper access. |
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*/ |
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clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state); |
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|
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/* |
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* There might be a few packets being processed right now (on |
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* another CPU) that have already gotten past the aggregation |
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* check when it was still OPERATIONAL and consequently have |
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* IEEE80211_TX_CTL_AMPDU set. In that case, this code might |
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* call into the driver at the same time or even before the |
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* TX paths calls into it, which could confuse the driver. |
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* |
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* Wait for all currently running TX paths to finish before |
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* telling the driver. New packets will not go through since |
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* the aggregation session is no longer OPERATIONAL. |
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*/ |
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if (!local->in_reconfig) |
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synchronize_net(); |
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|
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tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ? |
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WLAN_BACK_RECIPIENT : |
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WLAN_BACK_INITIATOR; |
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tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST; |
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|
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ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
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|
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/* HW shall not deny going back to legacy */ |
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if (WARN_ON(ret)) { |
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/* |
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* We may have pending packets get stuck in this case... |
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* Not bothering with a workaround for now. |
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*/ |
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} |
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|
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/* |
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* In the case of AGG_STOP_DESTROY_STA, the driver won't |
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* necessarily call ieee80211_stop_tx_ba_cb(), so this may |
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* seem like we can leave the tid_tx data pending forever. |
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* This is true, in a way, but "forever" is only until the |
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* station struct is actually destroyed. In the meantime, |
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* leaving it around ensures that we don't transmit packets |
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* to the driver on this TID which might confuse it. |
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*/ |
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|
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return 0; |
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} |
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|
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/* |
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* After sending add Block Ack request we activated a timer until |
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* add Block Ack response will arrive from the recipient. |
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* If this timer expires sta_addba_resp_timer_expired will be executed. |
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*/ |
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static void sta_addba_resp_timer_expired(struct timer_list *t) |
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{ |
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struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer); |
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struct sta_info *sta = tid_tx->sta; |
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u8 tid = tid_tx->tid; |
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|
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/* check if the TID waits for addBA response */ |
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if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) { |
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ht_dbg(sta->sdata, |
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"timer expired on %pM tid %d not expecting addBA response\n", |
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sta->sta.addr, tid); |
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return; |
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} |
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|
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ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n", |
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sta->sta.addr, tid); |
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|
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ieee80211_stop_tx_ba_session(&sta->sta, tid); |
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} |
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|
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static void ieee80211_send_addba_with_timeout(struct sta_info *sta, |
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struct tid_ampdu_tx *tid_tx) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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struct ieee80211_local *local = sta->local; |
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u8 tid = tid_tx->tid; |
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u16 buf_size; |
|
|
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/* activate the timer for the recipient's addBA response */ |
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mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL); |
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ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n", |
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sta->sta.addr, tid); |
|
|
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spin_lock_bh(&sta->lock); |
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sta->ampdu_mlme.last_addba_req_time[tid] = jiffies; |
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sta->ampdu_mlme.addba_req_num[tid]++; |
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spin_unlock_bh(&sta->lock); |
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|
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if (sta->sta.he_cap.has_he) { |
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buf_size = local->hw.max_tx_aggregation_subframes; |
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} else { |
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/* |
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* We really should use what the driver told us it will |
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* transmit as the maximum, but certain APs (e.g. the |
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* LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012) |
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* will crash when we use a lower number. |
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*/ |
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buf_size = IEEE80211_MAX_AMPDU_BUF_HT; |
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} |
|
|
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/* send AddBA request */ |
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ieee80211_send_addba_request(sdata, sta->sta.addr, tid, |
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tid_tx->dialog_token, |
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sta->tid_seq[tid] >> 4, |
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buf_size, tid_tx->timeout); |
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|
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WARN_ON(test_and_set_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)); |
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} |
|
|
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void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) |
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{ |
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struct tid_ampdu_tx *tid_tx; |
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struct ieee80211_local *local = sta->local; |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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struct ieee80211_ampdu_params params = { |
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.sta = &sta->sta, |
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.action = IEEE80211_AMPDU_TX_START, |
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.tid = tid, |
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.buf_size = 0, |
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.amsdu = false, |
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.timeout = 0, |
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}; |
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int ret; |
|
|
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid); |
|
|
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/* |
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* 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 == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) { |
|
return; |
|
} else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) { |
|
/* |
|
* We didn't send the request yet, so don't need to check |
|
* here if we already got a response, just mark as driver |
|
* ready immediately. |
|
*/ |
|
set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state); |
|
} else 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; |
|
} |
|
|
|
ieee80211_send_addba_with_timeout(sta, tid_tx); |
|
} |
|
|
|
/* |
|
* 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(struct timer_list *t) |
|
{ |
|
struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer); |
|
struct sta_info *sta = tid_tx->sta; |
|
u8 tid = tid_tx->tid; |
|
unsigned long timeout; |
|
|
|
if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) { |
|
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); |
|
return; |
|
} |
|
|
|
ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n", |
|
sta->sta.addr, tid); |
|
|
|
ieee80211_stop_tx_ba_session(&sta->sta, tid); |
|
} |
|
|
|
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 && |
|
sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ) |
|
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; |
|
tid_tx->sta = sta; |
|
tid_tx->tid = tid; |
|
|
|
/* response timer */ |
|
timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0); |
|
|
|
/* tx timer */ |
|
timer_setup(&tid_tx->session_timer, |
|
sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE); |
|
|
|
/* 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_SENT_ADDBA, &tid_tx->state)) { |
|
ieee80211_send_addba_with_timeout(sta, tid_tx); |
|
/* RESPONSE_RECEIVED state whould trigger the flow again */ |
|
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, buf_size; |
|
bool amsdu; |
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab); |
|
amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK; |
|
tid = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_TID_MASK); |
|
buf_size = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); |
|
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); |
|
}
|
|
|