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mac80211: A-MPDU Rx adding basic functionality 

This patch adds the basic needed abilities and functions for A-MPDU Rx session
changed functions:
 - ieee80211_sta_process_addba_request - Rx A-MPDU initialization enabled
 - ieee80211_stop - stops all A-MPDU Rx in case interface goes down
added functions:
 - ieee80211_send_delba - used for sending out Del BA in A-MPDU sessions
 - ieee80211_sta_stop_rx_BA_session - stopping Rx A-MPDU session
 - sta_rx_agg_session_timer_expired - stops A-MPDU Rx use if load is too
low

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ron Rindjunsky 2007-12-25 17:00:33 +02:00 committed by David S. Miller
parent 5aae288061
commit 07db218396
5 changed files with 232 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/ieee80211.h
View File

@ -472,6 +472,13 @@ enum ieee80211_back_actioncode {
WLAN_ACTION_DELBA = 2,
};
/* BACK (block-ack) parties */
enum ieee80211_back_parties {
WLAN_BACK_RECIPIENT = 0,
WLAN_BACK_INITIATOR = 1,
WLAN_BACK_TIMER = 2,
};
/* A-MSDU 802.11n */
#define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080

9
net/mac80211/ieee80211.c
View File

@ -292,9 +292,18 @@ static int ieee80211_stop(struct net_device *dev)
struct ieee80211_sub_if_data *sdata;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_if_init_conf conf;
struct sta_info *sta;
int i;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
list_for_each_entry(sta, &local->sta_list, list) {
for (i = 0; i < STA_TID_NUM; i++)
ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr,
i, WLAN_BACK_RECIPIENT,
WLAN_REASON_QSTA_LEAVE_QBSS);
}
netif_stop_queue(dev);
/*

3
net/mac80211/ieee80211_i.h
View File

@ -767,6 +767,9 @@ int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
int ieee80211_ht_addt_info_ie_to_ht_bss_info(
struct ieee80211_ht_addt_info *ht_add_info_ie,
struct ieee80211_ht_bss_info *bss_info);
void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *da,
u16 tid, u16 initiator, u16 reason);
void sta_rx_agg_session_timer_expired(unsigned long data);
/* ieee80211_iface.c */
int ieee80211_if_add(struct net_device *dev, const char *name,
struct net_device **new_dev, int type);

221
net/mac80211/ieee80211_sta.c
View File

@ -64,6 +64,11 @@
#define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
#define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
/* next values represent the buffer size for A-MPDU frame.
* According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
#define IEEE80211_MIN_AMPDU_BUF 0x8
#define IEEE80211_MAX_AMPDU_BUF 0x40
static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
@ -1005,7 +1010,8 @@ static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
struct ieee80211_mgmt *mgmt;
u16 capab;
skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
sizeof(mgmt->u.action.u.addba_resp));
if (!skb) {
printk(KERN_DEBUG "%s: failed to allocate buffer "
"for addba resp frame\n", dev->name);
@ -1047,9 +1053,14 @@ static void ieee80211_sta_process_addba_request(struct net_device *dev,
size_t len)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw *hw = &local->hw;
struct ieee80211_conf *conf = &hw->conf;
struct sta_info *sta;
u16 capab, tid, timeout, ba_policy, buf_size, status;
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;
DECLARE_MAC_BUF(mac);
sta = sta_info_get(local, mgmt->sa);
if (!sta)
@ -1058,28 +1069,216 @@ static void ieee80211_sta_process_addba_request(struct net_device *dev,
/* 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;
/* TODO - currently aggregation is declined (A-MPDU add BA request
* acceptance is not obligatory by 802.11n draft), but here is
* the entry point for dealing with it */
#ifdef MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_DEBUG "Add Block Ack request arrived,"
" currently denying it\n");
#endif /* MAC80211_HT_DEBUG */
status = WLAN_STATUS_REQUEST_DECLINED;
/* sanity check for incoming parameters:
* check if configuration can support the BA policy
* and if buffer size does not exceeds max value */
if (((ba_policy != 1)
&& (!(conf->ht_conf.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 "Block Ack Req with bad params from "
"%s on tid %u. policy %d, buffer size %d\n",
print_mac(mac, mgmt->sa), tid, ba_policy,
buf_size);
#endif /* CONFIG_MAC80211_HT_DEBUG */
goto end_no_lock;
}
/* determine default buffer size */
if (buf_size == 0) {
struct ieee80211_hw_mode *mode = conf->mode;
buf_size = IEEE80211_MIN_AMPDU_BUF;
buf_size = buf_size << mode->ht_info.ampdu_factor;
}
tid_agg_rx = &sta->ampdu_mlme.tid_rx[tid];
/* examine state machine */
spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
if (tid_agg_rx->state != HT_AGG_STATE_IDLE) {
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_DEBUG "unexpected Block Ack Req from "
"%s on tid %u\n",
print_mac(mac, mgmt->sa), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
goto end;
}
/* prepare reordering buffer */
tid_agg_rx->reorder_buf =
kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC);
if ((!tid_agg_rx->reorder_buf) && net_ratelimit()) {
printk(KERN_ERR "can not allocate reordering buffer "
"to tid %d\n", tid);
goto end;
}
memset(tid_agg_rx->reorder_buf, 0,
buf_size * sizeof(struct sk_buf *));
if (local->ops->ampdu_action)
ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
sta->addr, tid, start_seq_num);
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "Rx A-MPDU on tid %d result %d", tid, ret);
#endif /* CONFIG_MAC80211_HT_DEBUG */
if (ret) {
kfree(tid_agg_rx->reorder_buf);
goto end;
}
/* change state and send addba resp */
tid_agg_rx->state = HT_AGG_STATE_OPERATIONAL;
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;
end:
spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
end_no_lock:
ieee80211_send_addba_resp(sta->dev, sta->addr, tid, dialog_token,
status, 1, buf_size, timeout);
sta_info_put(sta);
}
void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
u16 initiator, u16 reason_code)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_if_sta *ifsta = &sdata->u.sta;
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
u16 params;
skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom + 1 +
sizeof(mgmt->u.action.u.delba));
if (!skb) {
printk(KERN_ERR "%s: failed to allocate buffer "
"for delba frame\n", dev->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, dev->dev_addr, ETH_ALEN);
if (sdata->type == IEEE80211_IF_TYPE_AP)
memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
else
memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
IEEE80211_STYPE_ACTION);
skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
mgmt->u.action.category = WLAN_CATEGORY_BACK;
mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
params = (u16)(initiator << 11); /* bit 11 initiator */
params |= (u16)(tid << 12); /* bit 15:12 TID number */
mgmt->u.action.u.delba.params = cpu_to_le16(params);
mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
ieee80211_sta_tx(dev, skb, 0);
}
void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
u16 initiator, u16 reason)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw *hw = &local->hw;
struct sta_info *sta;
int ret;
sta = sta_info_get(local, ra);
if (!sta)
return;
/* check if TID is in operational state */
spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
if (sta->ampdu_mlme.tid_rx[tid].state
!= HT_AGG_STATE_OPERATIONAL) {
spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
if (net_ratelimit())
printk(KERN_DEBUG "rx BA session requested to stop on "
"inactive tid %d\n", tid);
sta_info_put(sta);
return;
}
sta->ampdu_mlme.tid_rx[tid].state =
HT_AGG_STATE_REQ_STOP_BA_MSK |
(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
/* stop HW Rx aggregation. ampdu_action existence
* already verified in session init so we add the BUG_ON */
BUG_ON(!local->ops->ampdu_action);
ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
ra, tid, EINVAL);
if (ret)
printk(KERN_DEBUG "HW problem - can not stop rx "
"aggergation for tid %d\n", tid);
/* shutdown timer has not expired */
if (initiator != WLAN_BACK_TIMER)
del_timer_sync(&sta->ampdu_mlme.tid_rx[tid].
session_timer);
/* check if this is a self generated aggregation halt */
if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
ieee80211_send_delba(dev, ra, tid, 0, reason);
/* free the reordering buffer */
kfree(sta->ampdu_mlme.tid_rx[tid].reorder_buf);
sta->ampdu_mlme.tid_rx[tid].state = HT_AGG_STATE_IDLE;
sta_info_put(sta);
}
/*
* After receiving Block Ack Request (BAR) we activated a
* timer after each frame arrives from the originator.
* if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
*/
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 verious sta_info are needed here, so init
* flow in sta_info_add 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]);
printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
ieee80211_sta_stop_rx_ba_session(sta->dev, sta->addr, (u16)*ptid,
WLAN_BACK_TIMER,
WLAN_REASON_QSTA_TIMEOUT);
}
static void ieee80211_rx_mgmt_auth(struct net_device *dev,
struct ieee80211_if_sta *ifsta,
struct ieee80211_mgmt *mgmt,

3
net/mac80211/sta_info.c
View File

@ -104,6 +104,7 @@ static void sta_info_release(struct kref *kref)
struct sta_info *sta = container_of(kref, struct sta_info, kref);
struct ieee80211_local *local = sta->local;
struct sk_buff *skb;
int i;
/* free sta structure; it has already been removed from
* hash table etc. external structures. Make sure that all
@ -116,6 +117,8 @@ static void sta_info_release(struct kref *kref)
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
dev_kfree_skb_any(skb);
}
for (i = 0; i < STA_TID_NUM; i++)
del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer);
rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
rate_control_put(sta->rate_ctrl);
kfree(sta);