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mac80211: notify the driver upon BAR Rx 

When we receive a BAR, this typically means that our peer
doesn't hear our Block-Acks or that we can't hear its
frames. Either way, it is a good indication that the link
is in a bad condition. This is why it can serve as a probe
to the driver.
Use the event_callback callback for this.
Since more events with the same data will be added in the
feature, the structure that describes the data attached to
the event is called in a generic name: ieee80211_ba_event.

This also means that from now on, the event_callback can't
sleep.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Emmanuel Grumbach 2015-04-20 22:53:37 +03:00 committed by Johannes Berg
parent 6e70d560ff
commit 6382246e89
2 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
include/net/mac80211.h
View File

@ -337,10 +337,12 @@ enum ieee80211_bss_change {
* enum ieee80211_event_type - event to be notified to the low level driver
* @RSSI_EVENT: AP's rssi crossed the a threshold set by the driver.
* @MLME_EVENT: event related to MLME
* @BAR_RX_EVENT: a BAR was received
*/
enum ieee80211_event_type {
RSSI_EVENT,
MLME_EVENT,
BAR_RX_EVENT,
};
/**
@ -399,18 +401,32 @@ struct ieee80211_mlme_event {
u16 reason;
};
/**
* struct ieee80211_ba_event - data attached for BlockAck related events
* @sta: pointer to the &ieee80211_sta to which this event relates
* @tid: the tid
* @ssn: the starting sequence number
*/
struct ieee80211_ba_event {
struct ieee80211_sta *sta;
u16 tid;
u16 ssn;
};
/**
* struct ieee80211_event - event to be sent to the driver
* @type: The event itself. See &enum ieee80211_event_type.
* @rssi: relevant if &type is %RSSI_EVENT
* @mlme: relevant if &type is %AUTH_EVENT
* @u: union holding the above two fields
* @ba: relevant if &type is %BAR_RX_EVENT
* @u:union holding the fields above
*/
struct ieee80211_event {
enum ieee80211_event_type type;
union {
struct ieee80211_rssi_event rssi;
struct ieee80211_mlme_event mlme;
struct ieee80211_ba_event ba;
} u;
};
@ -3001,7 +3017,7 @@ enum ieee80211_reconfig_type {
* The callback can sleep.
* @event_callback: Notify driver about any event in mac80211. See
* &enum ieee80211_event_type for the different types.
* The callback can sleep.
* The callback must be atomic.
*
* @release_buffered_frames: Release buffered frames according to the given
* parameters. In the case where the driver buffers some frames for

8
net/mac80211/rx.c
View File

@ -2427,6 +2427,9 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
struct {
__le16 control, start_seq_num;
} __packed bar_data;
struct ieee80211_event event = {
.type = BAR_RX_EVENT,
};
if (!rx->sta)
return RX_DROP_MONITOR;
@ -2442,6 +2445,9 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
return RX_DROP_MONITOR;
start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
event.u.ba.tid = tid;
event.u.ba.ssn = start_seq_num;
event.u.ba.sta = &rx->sta->sta;
/* reset session timer */
if (tid_agg_rx->timeout)
@ -2454,6 +2460,8 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
start_seq_num, frames);
spin_unlock(&tid_agg_rx->reorder_lock);
drv_event_callback(rx->local, rx->sdata, &event);
kfree_skb(skb);
return RX_QUEUED;
}