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![Johannes Berg](/assets/img/avatar_default.png)
This adds sparse RCU annotations to most of mac80211, only the mesh code remains to be done. Due the the previous patches, the annotations are pretty simple. The only thing that this actually changes is removing the RCU usage of key->sta in debugfs since this pointer isn't actually an RCU-managed pointer (it only has a single assignment done before the key even goes live). As that is otherwise harmless, I decided to make it part of this patch. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
327 lines
10 KiB
C
327 lines
10 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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/**
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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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#include <linux/ieee80211.h>
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#include <linux/slab.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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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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dev_kfree_skb(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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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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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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if (!tid_rx)
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return;
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rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
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sta->sta.addr, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
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&sta->sta, tid, NULL, 0))
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printk(KERN_DEBUG "HW problem - can not stop rx "
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"aggregation for tid %d\n", 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, 0, reason);
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del_timer_sync(&tid_rx->session_timer);
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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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/*
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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(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 various sta_info are needed here, 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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u8 *ptid = (u8 *)data;
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u8 *timer_to_id = ptid - *ptid;
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struct sta_info *sta = container_of(timer_to_id, struct sta_info,
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timer_to_tid[0]);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
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#endif
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set_bit(*ptid, 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(unsigned long data)
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{
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u8 *ptid = (u8 *)data;
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u8 *timer_to_id = ptid - *ptid;
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struct sta_info *sta = container_of(timer_to_id, struct sta_info,
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timer_to_tid[0]);
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rcu_read_lock();
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ieee80211_release_reorder_timeout(sta, *ptid);
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rcu_read_unlock();
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}
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static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, 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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{
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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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printk(KERN_DEBUG "%s: failed to allocate buffer "
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"for addba resp frame\n", sdata->name);
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return;
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}
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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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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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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)(policy << 1); /* bit 1 aggregation policy */
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capab |= (u16)(tid << 2); /* bit 5:2 TID number */
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capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
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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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ieee80211_tx_skb(sdata, skb);
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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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struct tid_ampdu_rx *tid_agg_rx;
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u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
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u8 dialog_token;
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int ret = -EOPNOTSUPP;
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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;
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timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
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start_seq_num =
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le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
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capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
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ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
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tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
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buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
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status = WLAN_STATUS_REQUEST_DECLINED;
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if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Suspend in progress. "
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"Denying ADDBA request\n");
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#endif
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goto end_no_lock;
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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 > IEEE80211_MAX_AMPDU_BUF)) {
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status = WLAN_STATUS_INVALID_QOS_PARAM;
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "AddBA Req with bad params from "
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"%pM on tid %u. policy %d, buffer size %d\n",
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mgmt->sa, tid, ba_policy,
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buf_size);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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goto end_no_lock;
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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 = IEEE80211_MAX_AMPDU_BUF;
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/* make sure the size doesn't exceed the maximum supported by the hw */
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if (buf_size > local->hw.max_rx_aggregation_subframes)
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buf_size = local->hw.max_rx_aggregation_subframes;
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/* examine state machine */
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mutex_lock(&sta->ampdu_mlme.mtx);
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if (sta->ampdu_mlme.tid_rx[tid]) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_DEBUG "unexpected AddBA Req from "
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"%pM on tid %u\n",
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mgmt->sa, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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goto end;
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}
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/* prepare A-MPDU MLME for Rx aggregation */
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tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
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if (!tid_agg_rx) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
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tid);
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#endif
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goto end;
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}
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spin_lock_init(&tid_agg_rx->reorder_lock);
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/* rx timer */
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tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
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tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
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init_timer(&tid_agg_rx->session_timer);
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/* rx reorder timer */
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tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
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tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
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init_timer(&tid_agg_rx->reorder_timer);
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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 *), 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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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_ERR "can not allocate reordering buffer "
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"to tid %d\n", tid);
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#endif
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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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ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
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&sta->sta, tid, &start_seq_num, 0);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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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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/* update data */
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tid_agg_rx->dialog_token = dialog_token;
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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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status = WLAN_STATUS_SUCCESS;
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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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if (timeout)
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mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
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end:
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mutex_unlock(&sta->ampdu_mlme.mtx);
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end_no_lock:
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ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
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dialog_token, status, 1, buf_size, timeout);
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}
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