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547 lines
17 KiB
547 lines
17 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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/** |
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* DOC: RX A-MPDU aggregation |
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* |
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* Aggregation on the RX side requires only implementing the |
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* @ampdu_action callback that is invoked to start/stop any |
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* block-ack sessions for RX aggregation. |
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* |
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* When RX aggregation is started by the peer, the driver is |
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* notified via @ampdu_action function, with the |
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* %IEEE80211_AMPDU_RX_START action, and may reject the request |
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* in which case a negative response is sent to the peer, if it |
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* accepts it a positive response is sent. |
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* |
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* While the session is active, the device/driver are required |
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* to de-aggregate frames and pass them up one by one to mac80211, |
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* which will handle the reorder buffer. |
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* |
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* When the aggregation session is stopped again by the peer or |
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* ourselves, the driver's @ampdu_action function will be called |
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* with the action %IEEE80211_AMPDU_RX_STOP. In this case, the |
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* call must not fail. |
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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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|
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static void ieee80211_free_tid_rx(struct rcu_head *h) |
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{ |
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struct tid_ampdu_rx *tid_rx = |
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container_of(h, struct tid_ampdu_rx, rcu_head); |
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int i; |
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for (i = 0; i < tid_rx->buf_size; i++) |
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__skb_queue_purge(&tid_rx->reorder_buf[i]); |
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kfree(tid_rx->reorder_buf); |
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kfree(tid_rx->reorder_time); |
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kfree(tid_rx); |
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} |
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|
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void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
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u16 initiator, u16 reason, bool tx) |
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{ |
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struct ieee80211_local *local = sta->local; |
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struct tid_ampdu_rx *tid_rx; |
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struct ieee80211_ampdu_params params = { |
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.sta = &sta->sta, |
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.action = IEEE80211_AMPDU_RX_STOP, |
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.tid = tid, |
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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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lockdep_assert_held(&sta->ampdu_mlme.mtx); |
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tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], |
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lockdep_is_held(&sta->ampdu_mlme.mtx)); |
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|
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if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid)) |
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return; |
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RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); |
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__clear_bit(tid, sta->ampdu_mlme.agg_session_valid); |
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ht_dbg(sta->sdata, |
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"Rx BA session stop requested for %pM tid %u %s reason: %d\n", |
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sta->sta.addr, tid, |
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initiator == WLAN_BACK_RECIPIENT ? "recipient" : "initiator", |
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(int)reason); |
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if (drv_ampdu_action(local, sta->sdata, ¶ms)) |
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sdata_info(sta->sdata, |
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"HW problem - can not stop rx aggregation for %pM tid %d\n", |
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sta->sta.addr, tid); |
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/* check if this is a self generated aggregation halt */ |
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if (initiator == WLAN_BACK_RECIPIENT && tx) |
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ieee80211_send_delba(sta->sdata, sta->sta.addr, |
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tid, WLAN_BACK_RECIPIENT, reason); |
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|
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/* |
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* return here in case tid_rx is not assigned - which will happen if |
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* IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. |
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*/ |
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if (!tid_rx) |
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return; |
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del_timer_sync(&tid_rx->session_timer); |
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|
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/* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ |
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spin_lock_bh(&tid_rx->reorder_lock); |
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tid_rx->removed = true; |
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spin_unlock_bh(&tid_rx->reorder_lock); |
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del_timer_sync(&tid_rx->reorder_timer); |
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call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); |
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} |
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void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
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u16 initiator, u16 reason, bool tx) |
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{ |
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mutex_lock(&sta->ampdu_mlme.mtx); |
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___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); |
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mutex_unlock(&sta->ampdu_mlme.mtx); |
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} |
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void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, |
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const u8 *addr) |
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{ |
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
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struct sta_info *sta; |
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int i; |
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rcu_read_lock(); |
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sta = sta_info_get_bss(sdata, addr); |
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if (!sta) { |
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rcu_read_unlock(); |
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return; |
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} |
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for (i = 0; i < IEEE80211_NUM_TIDS; i++) |
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if (ba_rx_bitmap & BIT(i)) |
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set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); |
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ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
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rcu_read_unlock(); |
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} |
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EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); |
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|
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/* |
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* After accepting the AddBA Request we activated a timer, |
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* resetting it after each frame that arrives from the originator. |
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*/ |
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static void sta_rx_agg_session_timer_expired(struct timer_list *t) |
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{ |
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struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, session_timer); |
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struct sta_info *sta = tid_rx->sta; |
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u8 tid = tid_rx->tid; |
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unsigned long timeout; |
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timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); |
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if (time_is_after_jiffies(timeout)) { |
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mod_timer(&tid_rx->session_timer, timeout); |
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return; |
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} |
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ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", |
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sta->sta.addr, tid); |
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set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); |
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ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); |
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} |
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static void sta_rx_agg_reorder_timer_expired(struct timer_list *t) |
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{ |
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struct tid_ampdu_rx *tid_rx = from_timer(tid_rx, t, reorder_timer); |
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rcu_read_lock(); |
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ieee80211_release_reorder_timeout(tid_rx->sta, tid_rx->tid); |
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rcu_read_unlock(); |
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} |
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static void ieee80211_add_addbaext(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb, |
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const struct ieee80211_addba_ext_ie *req) |
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{ |
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struct ieee80211_supported_band *sband; |
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struct ieee80211_addba_ext_ie *resp; |
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const struct ieee80211_sta_he_cap *he_cap; |
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u8 frag_level, cap_frag_level; |
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u8 *pos; |
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sband = ieee80211_get_sband(sdata); |
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if (!sband) |
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return; |
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he_cap = ieee80211_get_he_iftype_cap(sband, sdata->vif.type); |
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if (!he_cap) |
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return; |
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pos = skb_put_zero(skb, 2 + sizeof(struct ieee80211_addba_ext_ie)); |
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*pos++ = WLAN_EID_ADDBA_EXT; |
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*pos++ = sizeof(struct ieee80211_addba_ext_ie); |
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resp = (struct ieee80211_addba_ext_ie *)pos; |
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resp->data = req->data & IEEE80211_ADDBA_EXT_NO_FRAG; |
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frag_level = u32_get_bits(req->data, |
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IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK); |
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cap_frag_level = u32_get_bits(he_cap->he_cap_elem.mac_cap_info[0], |
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IEEE80211_HE_MAC_CAP0_DYNAMIC_FRAG_MASK); |
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if (frag_level > cap_frag_level) |
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frag_level = cap_frag_level; |
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resp->data |= u8_encode_bits(frag_level, |
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IEEE80211_ADDBA_EXT_FRAG_LEVEL_MASK); |
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} |
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static void ieee80211_send_addba_resp(struct sta_info *sta, u8 *da, u16 tid, |
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u8 dialog_token, u16 status, u16 policy, |
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u16 buf_size, u16 timeout, |
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const struct ieee80211_addba_ext_ie *addbaext) |
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{ |
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struct ieee80211_sub_if_data *sdata = sta->sdata; |
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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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bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); |
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u16 capab; |
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skb = dev_alloc_skb(sizeof(*mgmt) + |
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2 + sizeof(struct ieee80211_addba_ext_ie) + |
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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_resp)); |
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mgmt->u.action.category = WLAN_CATEGORY_BACK; |
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mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; |
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mgmt->u.action.u.addba_resp.dialog_token = dialog_token; |
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capab = u16_encode_bits(amsdu, IEEE80211_ADDBA_PARAM_AMSDU_MASK); |
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capab |= u16_encode_bits(policy, 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(buf_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK); |
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mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); |
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mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); |
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mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); |
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if (sta->sta.he_cap.has_he && addbaext) |
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ieee80211_add_addbaext(sdata, skb, addbaext); |
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ieee80211_tx_skb(sdata, skb); |
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} |
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void ___ieee80211_start_rx_ba_session(struct sta_info *sta, |
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u8 dialog_token, u16 timeout, |
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u16 start_seq_num, u16 ba_policy, u16 tid, |
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u16 buf_size, bool tx, bool auto_seq, |
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const struct ieee80211_addba_ext_ie *addbaext) |
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{ |
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struct ieee80211_local *local = sta->sdata->local; |
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struct tid_ampdu_rx *tid_agg_rx; |
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struct ieee80211_ampdu_params params = { |
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.sta = &sta->sta, |
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.action = IEEE80211_AMPDU_RX_START, |
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.tid = tid, |
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.amsdu = false, |
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.timeout = timeout, |
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.ssn = start_seq_num, |
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}; |
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int i, ret = -EOPNOTSUPP; |
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u16 status = WLAN_STATUS_REQUEST_DECLINED; |
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u16 max_buf_size; |
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if (tid >= IEEE80211_FIRST_TSPEC_TSID) { |
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ht_dbg(sta->sdata, |
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"STA %pM requests BA session on unsupported tid %d\n", |
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sta->sta.addr, tid); |
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goto end; |
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} |
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if (!sta->sta.ht_cap.ht_supported && |
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sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ) { |
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ht_dbg(sta->sdata, |
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"STA %pM erroneously requests BA session on tid %d w/o QoS\n", |
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sta->sta.addr, tid); |
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/* send a response anyway, it's an error case if we get here */ |
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goto end; |
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} |
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if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) { |
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ht_dbg(sta->sdata, |
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"Suspend in progress - Denying ADDBA request (%pM tid %d)\n", |
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sta->sta.addr, tid); |
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goto end; |
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} |
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if (sta->sta.he_cap.has_he) |
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max_buf_size = IEEE80211_MAX_AMPDU_BUF; |
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else |
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max_buf_size = IEEE80211_MAX_AMPDU_BUF_HT; |
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|
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/* sanity check for incoming parameters: |
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* check if configuration can support the BA policy |
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* and if buffer size does not exceeds max value */ |
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/* XXX: check own ht delayed BA capability?? */ |
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if (((ba_policy != 1) && |
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(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || |
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(buf_size > max_buf_size)) { |
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status = WLAN_STATUS_INVALID_QOS_PARAM; |
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ht_dbg_ratelimited(sta->sdata, |
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"AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n", |
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sta->sta.addr, tid, ba_policy, buf_size); |
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goto end; |
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} |
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/* determine default buffer size */ |
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if (buf_size == 0) |
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buf_size = max_buf_size; |
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|
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/* make sure the size doesn't exceed the maximum supported by the hw */ |
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if (buf_size > sta->sta.max_rx_aggregation_subframes) |
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buf_size = sta->sta.max_rx_aggregation_subframes; |
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params.buf_size = buf_size; |
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ht_dbg(sta->sdata, "AddBA Req buf_size=%d for %pM\n", |
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buf_size, sta->sta.addr); |
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/* examine state machine */ |
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lockdep_assert_held(&sta->ampdu_mlme.mtx); |
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if (test_bit(tid, sta->ampdu_mlme.agg_session_valid)) { |
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if (sta->ampdu_mlme.tid_rx_token[tid] == dialog_token) { |
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struct tid_ampdu_rx *tid_rx; |
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ht_dbg_ratelimited(sta->sdata, |
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"updated AddBA Req from %pM on tid %u\n", |
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sta->sta.addr, tid); |
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/* We have no API to update the timeout value in the |
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* driver so reject the timeout update if the timeout |
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* changed. If it did not change, i.e., no real update, |
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* just reply with success. |
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*/ |
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rcu_read_lock(); |
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tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
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if (tid_rx && tid_rx->timeout == timeout) |
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status = WLAN_STATUS_SUCCESS; |
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else |
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status = WLAN_STATUS_REQUEST_DECLINED; |
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rcu_read_unlock(); |
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goto end; |
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} |
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ht_dbg_ratelimited(sta->sdata, |
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"unexpected AddBA Req from %pM on tid %u\n", |
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sta->sta.addr, tid); |
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/* delete existing Rx BA session on the same tid */ |
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___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, |
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WLAN_STATUS_UNSPECIFIED_QOS, |
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false); |
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} |
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if (ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) { |
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ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
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ht_dbg(sta->sdata, |
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"Rx A-MPDU request on %pM tid %d result %d\n", |
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sta->sta.addr, tid, ret); |
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if (!ret) |
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status = WLAN_STATUS_SUCCESS; |
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goto end; |
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} |
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|
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/* prepare A-MPDU MLME for Rx aggregation */ |
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tid_agg_rx = kzalloc(sizeof(*tid_agg_rx), GFP_KERNEL); |
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if (!tid_agg_rx) |
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goto end; |
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spin_lock_init(&tid_agg_rx->reorder_lock); |
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|
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/* rx timer */ |
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timer_setup(&tid_agg_rx->session_timer, |
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sta_rx_agg_session_timer_expired, TIMER_DEFERRABLE); |
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|
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/* rx reorder timer */ |
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timer_setup(&tid_agg_rx->reorder_timer, |
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sta_rx_agg_reorder_timer_expired, 0); |
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|
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/* prepare reordering buffer */ |
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tid_agg_rx->reorder_buf = |
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kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL); |
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tid_agg_rx->reorder_time = |
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kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL); |
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if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { |
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kfree(tid_agg_rx->reorder_buf); |
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kfree(tid_agg_rx->reorder_time); |
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kfree(tid_agg_rx); |
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goto end; |
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} |
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|
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for (i = 0; i < buf_size; i++) |
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__skb_queue_head_init(&tid_agg_rx->reorder_buf[i]); |
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|
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ret = drv_ampdu_action(local, sta->sdata, ¶ms); |
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ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n", |
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sta->sta.addr, tid, ret); |
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if (ret) { |
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kfree(tid_agg_rx->reorder_buf); |
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kfree(tid_agg_rx->reorder_time); |
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kfree(tid_agg_rx); |
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goto end; |
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} |
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|
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/* update data */ |
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tid_agg_rx->ssn = start_seq_num; |
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tid_agg_rx->head_seq_num = start_seq_num; |
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tid_agg_rx->buf_size = buf_size; |
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tid_agg_rx->timeout = timeout; |
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tid_agg_rx->stored_mpdu_num = 0; |
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tid_agg_rx->auto_seq = auto_seq; |
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tid_agg_rx->started = false; |
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tid_agg_rx->reorder_buf_filtered = 0; |
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tid_agg_rx->tid = tid; |
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tid_agg_rx->sta = sta; |
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status = WLAN_STATUS_SUCCESS; |
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|
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/* activate it for RX */ |
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rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); |
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|
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if (timeout) { |
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mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); |
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tid_agg_rx->last_rx = jiffies; |
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} |
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|
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end: |
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if (status == WLAN_STATUS_SUCCESS) { |
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__set_bit(tid, sta->ampdu_mlme.agg_session_valid); |
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__clear_bit(tid, sta->ampdu_mlme.unexpected_agg); |
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sta->ampdu_mlme.tid_rx_token[tid] = dialog_token; |
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} |
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|
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if (tx) |
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ieee80211_send_addba_resp(sta, sta->sta.addr, tid, |
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dialog_token, status, 1, buf_size, |
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timeout, addbaext); |
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} |
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|
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static void __ieee80211_start_rx_ba_session(struct sta_info *sta, |
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u8 dialog_token, u16 timeout, |
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u16 start_seq_num, u16 ba_policy, |
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u16 tid, u16 buf_size, bool tx, |
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bool auto_seq, |
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const struct ieee80211_addba_ext_ie *addbaext) |
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{ |
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mutex_lock(&sta->ampdu_mlme.mtx); |
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___ieee80211_start_rx_ba_session(sta, dialog_token, timeout, |
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start_seq_num, ba_policy, tid, |
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buf_size, tx, auto_seq, addbaext); |
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mutex_unlock(&sta->ampdu_mlme.mtx); |
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} |
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|
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void ieee80211_process_addba_request(struct ieee80211_local *local, |
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struct sta_info *sta, |
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struct ieee80211_mgmt *mgmt, |
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size_t len) |
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{ |
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u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num; |
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struct ieee802_11_elems elems = { }; |
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u8 dialog_token; |
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int ies_len; |
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|
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/* extract session parameters from addba request frame */ |
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dialog_token = mgmt->u.action.u.addba_req.dialog_token; |
|
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; |
|
|
|
ies_len = len - offsetof(struct ieee80211_mgmt, |
|
u.action.u.addba_req.variable); |
|
if (ies_len) { |
|
ieee802_11_parse_elems(mgmt->u.action.u.addba_req.variable, |
|
ies_len, true, &elems, mgmt->bssid, NULL); |
|
if (elems.parse_error) |
|
return; |
|
} |
|
|
|
__ieee80211_start_rx_ba_session(sta, dialog_token, timeout, |
|
start_seq_num, ba_policy, tid, |
|
buf_size, true, false, |
|
elems.addba_ext_ie); |
|
} |
|
|
|
void ieee80211_manage_rx_ba_offl(struct ieee80211_vif *vif, |
|
const u8 *addr, unsigned int tid) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
|
struct ieee80211_local *local = sdata->local; |
|
struct sta_info *sta; |
|
|
|
rcu_read_lock(); |
|
sta = sta_info_get_bss(sdata, addr); |
|
if (!sta) |
|
goto unlock; |
|
|
|
set_bit(tid, sta->ampdu_mlme.tid_rx_manage_offl); |
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
|
unlock: |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL(ieee80211_manage_rx_ba_offl); |
|
|
|
void ieee80211_rx_ba_timer_expired(struct ieee80211_vif *vif, |
|
const u8 *addr, unsigned int tid) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
|
struct ieee80211_local *local = sdata->local; |
|
struct sta_info *sta; |
|
|
|
rcu_read_lock(); |
|
sta = sta_info_get_bss(sdata, addr); |
|
if (!sta) |
|
goto unlock; |
|
|
|
set_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired); |
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); |
|
|
|
unlock: |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL(ieee80211_rx_ba_timer_expired);
|
|
|