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mac80211: add TDLS connection timeout

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Adding a timeout for tearing down a TDLS connection that
hasn't had ACKed traffic sent through it for a certain
amount of time.

Since we have no other monitoring facility to indicate the
existance (or non-existance) of a peer, this patch will
cause a peer to be considered as unavailable if for some X
time at least some Y packets have all not been ACKed.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Liad Kaufman 2014-09-04 08:28:40 +03:00 committed by Johannes Berg
parent 5935839ad7
commit 9d58f25b12
2 changed files with 23 additions and 1 deletions
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3
net/mac80211/sta_info.h
View file

@ -450,6 +450,9 @@ struct sta_info {
enum ieee80211_smps_mode known_smps_mode;
const struct ieee80211_cipher_scheme *cipher_scheme;
/* TDLS timeout data */
unsigned long last_tdls_pkt_time;
/* keep last! */
struct ieee80211_sta sta;
};

21
net/mac80211/status.c
View file

@ -538,6 +538,8 @@ static void ieee80211_tx_latency_end_msrmnt(struct ieee80211_local *local,
* - current throughput (higher value for higher tpt)?
*/
#define STA_LOST_PKT_THRESHOLD 50
#define STA_LOST_TDLS_PKT_THRESHOLD 10
#define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
static void ieee80211_lost_packet(struct sta_info *sta, struct sk_buff *skb)
{
@ -548,7 +550,20 @@ static void ieee80211_lost_packet(struct sta_info *sta, struct sk_buff *skb)
!(info->flags & IEEE80211_TX_STAT_AMPDU))
return;
if (++sta->lost_packets < STA_LOST_PKT_THRESHOLD)
sta->lost_packets++;
if (!sta->sta.tdls && sta->lost_packets < STA_LOST_PKT_THRESHOLD)
return;
/*
* If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
* of the last packets were lost, and that no ACK was received in the
* last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
* mechanism.
*/
if (sta->sta.tdls &&
(sta->lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
time_before(jiffies,
sta->last_tdls_pkt_time + STA_LOST_TDLS_PKT_TIME)))
return;
cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
@ -695,6 +710,10 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
if (info->flags & IEEE80211_TX_STAT_ACK) {
if (sta->lost_packets)
sta->lost_packets = 0;
/* Track when last TDLS packet was ACKed */
if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
sta->last_tdls_pkt_time = jiffies;
} else {
ieee80211_lost_packet(sta, skb);
}