347 lines
11 KiB
C
347 lines
11 KiB
C
/*
|
|
* HT handling
|
|
*
|
|
* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
|
|
* Copyright 2002-2005, Instant802 Networks, Inc.
|
|
* Copyright 2005-2006, Devicescape Software, Inc.
|
|
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
|
|
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
|
|
* Copyright 2007-2010, Intel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
/**
|
|
* DOC: RX A-MPDU aggregation
|
|
*
|
|
* Aggregation on the RX side requires only implementing the
|
|
* @ampdu_action callback that is invoked to start/stop any
|
|
* block-ack sessions for RX aggregation.
|
|
*
|
|
* When RX aggregation is started by the peer, the driver is
|
|
* notified via @ampdu_action function, with the
|
|
* %IEEE80211_AMPDU_RX_START action, and may reject the request
|
|
* in which case a negative response is sent to the peer, if it
|
|
* accepts it a positive response is sent.
|
|
*
|
|
* While the session is active, the device/driver are required
|
|
* to de-aggregate frames and pass them up one by one to mac80211,
|
|
* which will handle the reorder buffer.
|
|
*
|
|
* When the aggregation session is stopped again by the peer or
|
|
* ourselves, the driver's @ampdu_action function will be called
|
|
* with the action %IEEE80211_AMPDU_RX_STOP. In this case, the
|
|
* call must not fail.
|
|
*/
|
|
|
|
#include <linux/ieee80211.h>
|
|
#include <linux/slab.h>
|
|
#include <net/mac80211.h>
|
|
#include "ieee80211_i.h"
|
|
#include "driver-ops.h"
|
|
|
|
static void ieee80211_free_tid_rx(struct rcu_head *h)
|
|
{
|
|
struct tid_ampdu_rx *tid_rx =
|
|
container_of(h, struct tid_ampdu_rx, rcu_head);
|
|
int i;
|
|
|
|
for (i = 0; i < tid_rx->buf_size; i++)
|
|
dev_kfree_skb(tid_rx->reorder_buf[i]);
|
|
kfree(tid_rx->reorder_buf);
|
|
kfree(tid_rx->reorder_time);
|
|
kfree(tid_rx);
|
|
}
|
|
|
|
void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
|
|
u16 initiator, u16 reason, bool tx)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
struct tid_ampdu_rx *tid_rx;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
|
|
lockdep_is_held(&sta->ampdu_mlme.mtx));
|
|
|
|
if (!tid_rx)
|
|
return;
|
|
|
|
rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
|
|
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
|
|
sta->sta.addr, tid);
|
|
#endif /* CONFIG_MAC80211_HT_DEBUG */
|
|
|
|
if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
|
|
&sta->sta, tid, NULL, 0))
|
|
printk(KERN_DEBUG "HW problem - can not stop rx "
|
|
"aggregation for tid %d\n", tid);
|
|
|
|
/* check if this is a self generated aggregation halt */
|
|
if (initiator == WLAN_BACK_RECIPIENT && tx)
|
|
ieee80211_send_delba(sta->sdata, sta->sta.addr,
|
|
tid, 0, reason);
|
|
|
|
del_timer_sync(&tid_rx->session_timer);
|
|
del_timer_sync(&tid_rx->reorder_timer);
|
|
|
|
call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
|
|
}
|
|
|
|
void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
|
|
u16 initiator, u16 reason, bool tx)
|
|
{
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
}
|
|
|
|
void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
|
|
const u8 *addr)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
struct sta_info *sta = sta_info_get(sdata, addr);
|
|
int i;
|
|
|
|
for (i = 0; i < STA_TID_NUM; i++)
|
|
if (ba_rx_bitmap & BIT(i))
|
|
set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
|
|
|
|
ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
|
|
|
|
/*
|
|
* After accepting the AddBA Request we activated a timer,
|
|
* resetting it after each frame that arrives from the originator.
|
|
*/
|
|
static void sta_rx_agg_session_timer_expired(unsigned long data)
|
|
{
|
|
/* not an elegant detour, but there is no choice as the timer passes
|
|
* only one argument, and various sta_info are needed here, so init
|
|
* flow in sta_info_create gives the TID as data, while the timer_to_id
|
|
* array gives the sta through container_of */
|
|
u8 *ptid = (u8 *)data;
|
|
u8 *timer_to_id = ptid - *ptid;
|
|
struct sta_info *sta = container_of(timer_to_id, struct sta_info,
|
|
timer_to_tid[0]);
|
|
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
|
|
#endif
|
|
set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
|
|
ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
|
|
}
|
|
|
|
static void sta_rx_agg_reorder_timer_expired(unsigned long data)
|
|
{
|
|
u8 *ptid = (u8 *)data;
|
|
u8 *timer_to_id = ptid - *ptid;
|
|
struct sta_info *sta = container_of(timer_to_id, struct sta_info,
|
|
timer_to_tid[0]);
|
|
|
|
rcu_read_lock();
|
|
ieee80211_release_reorder_timeout(sta, *ptid);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
|
|
u8 dialog_token, u16 status, u16 policy,
|
|
u16 buf_size, u16 timeout)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_mgmt *mgmt;
|
|
u16 capab;
|
|
|
|
skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
|
|
|
|
if (!skb) {
|
|
printk(KERN_DEBUG "%s: failed to allocate buffer "
|
|
"for addba resp frame\n", sdata->name);
|
|
return;
|
|
}
|
|
|
|
skb_reserve(skb, local->hw.extra_tx_headroom);
|
|
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
|
|
memset(mgmt, 0, 24);
|
|
memcpy(mgmt->da, da, ETH_ALEN);
|
|
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP ||
|
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
|
|
else if (sdata->vif.type == NL80211_IFTYPE_STATION)
|
|
memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
|
|
|
|
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
|
|
IEEE80211_STYPE_ACTION);
|
|
|
|
skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
|
|
mgmt->u.action.category = WLAN_CATEGORY_BACK;
|
|
mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
|
|
mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
|
|
|
|
capab = (u16)(policy << 1); /* bit 1 aggregation policy */
|
|
capab |= (u16)(tid << 2); /* bit 5:2 TID number */
|
|
capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
|
|
|
|
mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
|
|
mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
|
|
mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
|
|
|
|
ieee80211_tx_skb(sdata, skb);
|
|
}
|
|
|
|
void ieee80211_process_addba_request(struct ieee80211_local *local,
|
|
struct sta_info *sta,
|
|
struct ieee80211_mgmt *mgmt,
|
|
size_t len)
|
|
{
|
|
struct tid_ampdu_rx *tid_agg_rx;
|
|
u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
|
|
u8 dialog_token;
|
|
int ret = -EOPNOTSUPP;
|
|
|
|
/* extract session parameters from addba request frame */
|
|
dialog_token = mgmt->u.action.u.addba_req.dialog_token;
|
|
timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
|
|
start_seq_num =
|
|
le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
|
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
|
|
ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
|
|
tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
|
|
buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
|
|
|
|
status = WLAN_STATUS_REQUEST_DECLINED;
|
|
|
|
if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Suspend in progress. "
|
|
"Denying ADDBA request\n");
|
|
#endif
|
|
goto end_no_lock;
|
|
}
|
|
|
|
/* sanity check for incoming parameters:
|
|
* check if configuration can support the BA policy
|
|
* and if buffer size does not exceeds max value */
|
|
/* XXX: check own ht delayed BA capability?? */
|
|
if (((ba_policy != 1) &&
|
|
(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
|
|
(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
|
|
status = WLAN_STATUS_INVALID_QOS_PARAM;
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "AddBA Req with bad params from "
|
|
"%pM on tid %u. policy %d, buffer size %d\n",
|
|
mgmt->sa, tid, ba_policy,
|
|
buf_size);
|
|
#endif /* CONFIG_MAC80211_HT_DEBUG */
|
|
goto end_no_lock;
|
|
}
|
|
/* determine default buffer size */
|
|
if (buf_size == 0)
|
|
buf_size = IEEE80211_MAX_AMPDU_BUF;
|
|
|
|
/* make sure the size doesn't exceed the maximum supported by the hw */
|
|
if (buf_size > local->hw.max_rx_aggregation_subframes)
|
|
buf_size = local->hw.max_rx_aggregation_subframes;
|
|
|
|
/* examine state machine */
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
|
|
if (sta->ampdu_mlme.tid_rx[tid]) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "unexpected AddBA Req from "
|
|
"%pM on tid %u\n",
|
|
mgmt->sa, tid);
|
|
#endif /* CONFIG_MAC80211_HT_DEBUG */
|
|
|
|
/* delete existing Rx BA session on the same tid */
|
|
___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
|
|
WLAN_STATUS_UNSPECIFIED_QOS,
|
|
false);
|
|
}
|
|
|
|
/* prepare A-MPDU MLME for Rx aggregation */
|
|
tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
|
|
if (!tid_agg_rx) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
|
|
tid);
|
|
#endif
|
|
goto end;
|
|
}
|
|
|
|
spin_lock_init(&tid_agg_rx->reorder_lock);
|
|
|
|
/* rx timer */
|
|
tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
|
|
tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
|
|
init_timer(&tid_agg_rx->session_timer);
|
|
|
|
/* rx reorder timer */
|
|
tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
|
|
tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
|
|
init_timer(&tid_agg_rx->reorder_timer);
|
|
|
|
/* prepare reordering buffer */
|
|
tid_agg_rx->reorder_buf =
|
|
kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL);
|
|
tid_agg_rx->reorder_time =
|
|
kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
|
|
if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_ERR "can not allocate reordering buffer "
|
|
"to tid %d\n", tid);
|
|
#endif
|
|
kfree(tid_agg_rx->reorder_buf);
|
|
kfree(tid_agg_rx->reorder_time);
|
|
kfree(tid_agg_rx);
|
|
goto end;
|
|
}
|
|
|
|
ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
|
|
&sta->sta, tid, &start_seq_num, 0);
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
|
|
#endif /* CONFIG_MAC80211_HT_DEBUG */
|
|
|
|
if (ret) {
|
|
kfree(tid_agg_rx->reorder_buf);
|
|
kfree(tid_agg_rx->reorder_time);
|
|
kfree(tid_agg_rx);
|
|
goto end;
|
|
}
|
|
|
|
/* update data */
|
|
tid_agg_rx->dialog_token = dialog_token;
|
|
tid_agg_rx->ssn = start_seq_num;
|
|
tid_agg_rx->head_seq_num = start_seq_num;
|
|
tid_agg_rx->buf_size = buf_size;
|
|
tid_agg_rx->timeout = timeout;
|
|
tid_agg_rx->stored_mpdu_num = 0;
|
|
status = WLAN_STATUS_SUCCESS;
|
|
|
|
/* activate it for RX */
|
|
rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
|
|
|
|
if (timeout)
|
|
mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
|
|
|
|
end:
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
|
|
end_no_lock:
|
|
ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
|
|
dialog_token, status, 1, buf_size, timeout);
|
|
}
|