litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'kernel/workqueue.c')

0 files changed, 0 insertions, 0 deletions

/* * HT handling * * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> * Copyright 2007, Michael Wu <flamingice@sourmilk.net> * Copyright 2007-2010, Intel Corporation * Copyright(c) 2015 Intel Deutschland GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /** * DOC: RX A-MPDU aggregation * * Aggregation on the RX side requires only implementing the * @ampdu_action callback that is invoked to start/stop any * block-ack sessions for RX aggregation. * * When RX aggregation is started by the peer, the driver is * notified via @ampdu_action function, with the * %IEEE80211_AMPDU_RX_START action, and may reject the request * in which case a negative response is sent to the peer, if it * accepts it a positive response is sent. * * While the session is active, the device/driver are required * to de-aggregate frames and pass them up one by one to mac80211, * which will handle the reorder buffer. * * When the aggregation session is stopped again by the peer or * ourselves, the driver's @ampdu_action function will be called * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the * call must not fail. */ #include <linux/ieee80211.h> #include <linux/slab.h> #include <linux/export.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "driver-ops.h" static void ieee80211_free_tid_rx(struct rcu_head *h) { struct tid_ampdu_rx *tid_rx = container_of(h, struct tid_ampdu_rx, rcu_head); int i; for (i = 0; i < tid_rx->buf_size; i++) __skb_queue_purge(&tid_rx->reorder_buf[i]); kfree(tid_rx->reorder_buf); kfree(tid_rx->reorder_time); kfree(tid_rx); } void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool tx) { struct ieee80211_local *local = sta->local; struct tid_ampdu_rx *tid_rx; struct ieee80211_ampdu_params params = { .sta = &sta->sta, .action = IEEE80211_AMPDU_RX_STOP, .tid = tid, .amsdu = false, .timeout = 0, .ssn = 0, }; lockdep_assert_held(&sta->ampdu_mlme.mtx); tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid], lockdep_is_held(&sta->ampdu_mlme.mtx)); if (!test_bit(tid, sta->ampdu_mlme.agg_session_valid)) return; RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL); __clear_bit(tid, sta->ampdu_mlme.agg_session_valid); ht_dbg(sta->sdata, "Rx BA session stop requested for %pM tid %u %s reason: %d\n", sta->sta.addr, tid, initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator", (int)reason); if (drv_ampdu_action(local, sta->sdata, &params)) sdata_info(sta->sdata, "HW problem - can not stop rx aggregation for %pM tid %d\n", sta->sta.addr, tid); /* check if this is a self generated aggregation halt */ if (initiator == WLAN_BACK_RECIPIENT && tx) ieee80211_send_delba(sta->sdata, sta->sta.addr, tid, WLAN_BACK_RECIPIENT, reason); /* * return here in case tid_rx is not assigned - which will happen if * IEEE80211_HW_SUPPORTS_REORDERING_BUFFER is set. */ if (!tid_rx) return; del_timer_sync(&tid_rx->session_timer); /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */ spin_lock_bh(&tid_rx->reorder_lock); tid_rx->removed = true; spin_unlock_bh(&tid_rx->reorder_lock); del_timer_sync(&tid_rx->reorder_timer); call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); } void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason, bool tx) { mutex_lock(&sta->ampdu_mlme.mtx); ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx); mutex_unlock(&sta->ampdu_mlme.mtx); } void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, const u8 *addr) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct sta_info *sta; int i; rcu_read_lock(); sta = sta_info_get_bss(sdata, addr); if (!sta) { rcu_read_unlock(); return; } for (i = 0; i < IEEE80211_NUM_TIDS; i++) if (ba_rx_bitmap & BIT(i)) set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); rcu_read_unlock(); } EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); /* * After accepting the AddBA Request we activated a timer, * resetting it after each frame that arrives from the originator. */ static void sta_rx_agg_session_timer_expired(unsigned long data) { /* not an elegant detour, but there is no choice as the timer passes * only one argument, and various sta_info are needed here, so init * flow in sta_info_create gives the TID as data, while the timer_to_id * array gives the sta through container_of */ u8 *ptid = (u8 *)data; u8 *timer_to_id = ptid - *ptid; struct sta_info *sta = container_of(timer_to_id, struct sta_info, timer_to_tid[0]); struct tid_ampdu_rx *tid_rx; unsigned long timeout; rcu_read_lock(); tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]); if (!tid_rx) { rcu_read_unlock(); return; } timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout); if (time_is_after_jiffies(timeout)) { mod_timer(&tid_rx->session_timer, timeout); rcu_read_unlock(); return; } rcu_read_unlock(); ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n", sta->sta.addr, (u16)*ptid); set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired); ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); } static void sta_rx_agg_reorder_timer_expired(unsigned long data) { u8 *ptid = (u8 *)data; u8 *timer_to_id = ptid - *ptid; struct sta_info *sta = container_of(timer_to_id, struct sta_info, timer_to_tid[0]); rcu_read_lock(); ieee80211_release_reorder_timeout(sta, *ptid); rcu_read_unlock(); } static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, u8 dialog_token, u16 status, u16 policy, u16 buf_size, u16 timeout) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; bool amsdu = ieee80211_hw_check(&local->hw, SUPPORTS_AMSDU_IN_AMPDU); u16 capab; skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); if (!skb) return; skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, da, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_AP_VLAN || sdata->vif.type == NL80211_IFTYPE_MESH_POINT) memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_STATION) memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); mgmt->u.action.category = WLAN_CATEGORY_BACK; mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; mgmt->u.action.u.addba_resp.dialog_token = dialog_token; capab = (u16)(amsdu << 0); /* bit 0 A-MSDU support */ capab |= (u16)(policy << 1); /* bit 1 aggregation policy */ capab |= (u16)(tid << 2); /* bit 5:2 TID number */ capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); ieee80211_tx_skb(sdata, skb); } void __ieee80211_start_rx_ba_session(struct sta_info *sta,


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