![Johannes Berg](/assets/img/avatar_default.png)
Since we want the code to be able to sleep in the future, it must not be called from the timer directly. To prepare, move it out into the aggregation work. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
284 lines
8.6 KiB
C
284 lines
8.6 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 2007-2008, 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 <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)
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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->lock);
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tid_rx = sta->ampdu_mlme.tid_rx[tid];
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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))
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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)
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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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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)
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{
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spin_lock_bh(&sta->lock);
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___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
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spin_unlock_bh(&sta->lock);
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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 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 ieee80211_hw *hw = &local->hw;
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struct ieee80211_conf *conf = &hw->conf;
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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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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[conf->channel->band];
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buf_size = IEEE80211_MIN_AMPDU_BUF;
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buf_size = buf_size << sband->ht_cap.ampdu_factor;
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}
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/* examine state machine */
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spin_lock_bh(&sta->lock);
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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_ATOMIC);
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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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/* 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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/* prepare reordering buffer */
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tid_agg_rx->reorder_buf =
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kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
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tid_agg_rx->reorder_time =
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kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
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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);
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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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end:
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spin_unlock_bh(&sta->lock);
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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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