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c6e133277b
ATM, {ADD,DEL}BA and BAR frames are sent on the AC matching the TID of
the BA parameters. In the discussion [1] about this patch, Johannes
recalled that it fixed some races with the DELBA and indeed this
behavior was introduced in [2].
While [2] is right for the BARs, the part queueing the {ADD,DEL}BAs on
their BA params TID AC violates the spec and is more a workaround for
some drivers. Helmut expressed some concerns wrt such drivers, in
particular DELBAs in rt2x00.
ATM, DELBAs are sent after a driver has called (hence "purposely")
ieee80211_start_tx_ba_cb_irqsafe and Johannes and Emmanuel gave some
details wrt intentions behind the split of the IEEE80211_AMPDU_TX_STOP_*
given to the driver ampdu_action supposed to call this function, which
could prove handy to people trying to do the right thing in faulty
drivers (if their fw/hw don't get in their way).
[1] http://mid.gmane.org/1390391564-18481-1-git-send-email-karl.beldan@gmail.com
[2] Commit: cf6bb79ad8
("mac80211: Use appropriate TID for sending BAR, ADDBA and DELBA frames")
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
932 lines
28 KiB
C
932 lines
28 KiB
C
/*
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* HT handling
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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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 <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2007-2010, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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* 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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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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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 = (struct ieee80211_mgmt *) skb_put(skb, 24);
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memset(mgmt, 0, 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 = (u16)(1 << 1); /* bit 1 aggregation policy */
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capab |= (u16)(tid << 2); /* bit 5:2 TID number */
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capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
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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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ieee80211_tx_skb(sdata, skb);
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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 = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
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memset(bar, 0, 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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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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static inline int ieee80211_ac_from_tid(int tid)
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{
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return ieee802_1d_to_ac[tid & 7];
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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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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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__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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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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__release(agg_queue);
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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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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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* 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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/* 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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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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enum ieee80211_ampdu_mlme_action action;
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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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action = IEEE80211_AMPDU_TX_STOP_CONT;
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break;
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case AGG_STOP_DESTROY_STA:
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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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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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* 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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ret = drv_ampdu_action(local, sta->sdata,
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IEEE80211_AMPDU_TX_STOP_FLUSH_CONT,
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&sta->sta, tid, NULL, 0);
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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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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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* 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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* 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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synchronize_net();
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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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ret = drv_ampdu_action(local, sta->sdata, action,
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&sta->sta, tid, NULL, 0);
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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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* 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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return 0;
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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(unsigned long data)
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{
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/* not an elegant detour, but there is no choice as the timer passes
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* only one argument, and both sta_info and TID are needed, so init
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* flow in sta_info_create gives the TID as data, while the timer_to_id
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* array gives the sta through container_of */
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u16 tid = *(u8 *)data;
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struct sta_info *sta = container_of((void *)data,
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struct sta_info, timer_to_tid[tid]);
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struct tid_ampdu_tx *tid_tx;
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/* check if the TID waits for addBA response */
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rcu_read_lock();
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tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
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if (!tid_tx ||
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test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
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rcu_read_unlock();
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ht_dbg(sta->sdata,
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"timer expired on %pM tid %d but we are not (or no longer) expecting addBA response there\n",
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sta->sta.addr, tid);
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return;
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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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ieee80211_stop_tx_ba_session(&sta->sta, tid);
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rcu_read_unlock();
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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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u16 start_seq_num;
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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.
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* We're going to release them once the driver is OK with
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* that.
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*/
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clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
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/*
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* Make sure no packets are being processed. This ensures that
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* we have a valid starting sequence number and that in-flight
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* packets have been flushed out and no packets for this TID
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* will go into the driver during the ampdu_action call.
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*/
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synchronize_net();
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start_seq_num = sta->tid_seq[tid] >> 4;
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|
|
|
ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
|
|
&sta->sta, tid, &start_seq_num, 0);
|
|
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);
|
|
|
|
kfree_rcu(tid_tx, rcu_head);
|
|
return;
|
|
}
|
|
|
|
/* activate the timer for the recipient's addBA response */
|
|
mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
|
|
ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
|
|
sta->ampdu_mlme.addba_req_num[tid]++;
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
/* send AddBA request */
|
|
ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
|
|
tid_tx->dialog_token, start_seq_num,
|
|
local->hw.max_tx_aggregation_subframes,
|
|
tid_tx->timeout);
|
|
}
|
|
|
|
/*
|
|
* After accepting the AddBA Response we activated a timer,
|
|
* resetting it after each frame that we send.
|
|
*/
|
|
static void sta_tx_agg_session_timer_expired(unsigned long data)
|
|
{
|
|
/* not an elegant detour, but there is no choice as the timer passes
|
|
* only one argument, and various sta_info are needed here, so init
|
|
* flow in sta_info_create gives the TID as data, while the timer_to_id
|
|
* array gives the sta through container_of */
|
|
u8 *ptid = (u8 *)data;
|
|
u8 *timer_to_id = ptid - *ptid;
|
|
struct sta_info *sta = container_of(timer_to_id, struct sta_info,
|
|
timer_to_tid[0]);
|
|
struct tid_ampdu_tx *tid_tx;
|
|
unsigned long timeout;
|
|
|
|
rcu_read_lock();
|
|
tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[*ptid]);
|
|
if (!tid_tx || test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
|
|
if (time_is_after_jiffies(timeout)) {
|
|
mod_timer(&tid_tx->session_timer, timeout);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
|
|
sta->sta.addr, (u16)*ptid);
|
|
|
|
ieee80211_stop_tx_ba_session(&sta->sta, *ptid);
|
|
}
|
|
|
|
int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
|
|
u16 timeout)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
int ret = 0;
|
|
|
|
trace_api_start_tx_ba_session(pubsta, tid);
|
|
|
|
if (WARN_ON_ONCE(!local->ops->ampdu_action))
|
|
return -EINVAL;
|
|
|
|
if ((tid >= IEEE80211_NUM_TIDS) ||
|
|
!(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
|
|
(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
|
|
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 - waiting a grace period after %d failed requests on %pM tid %u\n",
|
|
sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
|
|
ret = -EBUSY;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
/* check if the TID is not in aggregation flow already */
|
|
if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
|
|
ht_dbg(sdata,
|
|
"BA request denied - session is not idle on %pM tid %u\n",
|
|
sta->sta.addr, tid);
|
|
ret = -EAGAIN;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
/* prepare A-MPDU MLME for Tx aggregation */
|
|
tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
|
|
if (!tid_tx) {
|
|
ret = -ENOMEM;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
skb_queue_head_init(&tid_tx->pending);
|
|
__set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
|
|
|
|
tid_tx->timeout = timeout;
|
|
|
|
/* response timer */
|
|
tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
|
|
tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
|
|
init_timer(&tid_tx->addba_resp_timer);
|
|
|
|
/* tx timer */
|
|
tid_tx->session_timer.function = sta_tx_agg_session_timer_expired;
|
|
tid_tx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
|
|
init_timer_deferrable(&tid_tx->session_timer);
|
|
|
|
/* 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;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
drv_ampdu_action(local, sta->sdata,
|
|
IEEE80211_AMPDU_TX_OPERATIONAL,
|
|
&sta->sta, tid, NULL, tid_tx->buf_size);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, 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);
|
|
|
|
if (tid >= IEEE80211_NUM_TIDS) {
|
|
ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
|
|
tid, IEEE80211_NUM_TIDS);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
sta = sta_info_get_bss(sdata, ra);
|
|
if (!sta) {
|
|
mutex_unlock(&local->sta_mtx);
|
|
ht_dbg(sdata, "Could not find station: %pM\n", ra);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (WARN_ON(!tid_tx)) {
|
|
ht_dbg(sdata, "addBA was not requested!\n");
|
|
goto unlock;
|
|
}
|
|
|
|
if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
|
|
goto unlock;
|
|
|
|
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
|
|
ieee80211_agg_tx_operational(local, sta, tid);
|
|
|
|
unlock:
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
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 ieee80211_ra_tid *ra_tid;
|
|
struct sk_buff *skb = dev_alloc_skb(0);
|
|
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
|
|
memcpy(&ra_tid->ra, ra, ETH_ALEN);
|
|
ra_tid->tid = tid;
|
|
|
|
skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
|
|
skb_queue_tail(&sdata->skb_queue, skb);
|
|
ieee80211_queue_work(&local->hw, &sdata->work);
|
|
}
|
|
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;
|
|
}
|
|
|
|
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 ieee80211_vif *vif, u8 *ra, u8 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);
|
|
|
|
if (tid >= IEEE80211_NUM_TIDS) {
|
|
ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
|
|
tid, IEEE80211_NUM_TIDS);
|
|
return;
|
|
}
|
|
|
|
ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n", ra, tid);
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
sta = sta_info_get_bss(sdata, ra);
|
|
if (!sta) {
|
|
ht_dbg(sdata, "Could not find station: %pM\n", ra);
|
|
goto unlock;
|
|
}
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (!tid_tx || !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)
|
|
ieee80211_send_delba(sta->sdata, ra, tid,
|
|
WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
|
|
|
|
ieee80211_remove_tid_tx(sta, tid);
|
|
|
|
unlock_sta:
|
|
spin_unlock_bh(&sta->lock);
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
unlock:
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
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 ieee80211_ra_tid *ra_tid;
|
|
struct sk_buff *skb = dev_alloc_skb(0);
|
|
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
|
|
memcpy(&ra_tid->ra, ra, ETH_ALEN);
|
|
ra_tid->tid = tid;
|
|
|
|
skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
|
|
skb_queue_tail(&sdata->skb_queue, skb);
|
|
ieee80211_queue_work(&local->hw, &sdata->work);
|
|
}
|
|
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;
|
|
u16 capab, tid;
|
|
u8 buf_size;
|
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
|
|
tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
|
|
buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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);
|
|
}
|