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mac80211: wait for the first beacon on the new channel after CSA

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Instead of immediately reopening the queues (in case of block_tx),
calling the post_channel_switch operation and sending the
notification, wait for the first beacon on the new channel.  This
makes sure that we don't lose packets if the AP/GO is not on the new
channel yet.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Luciano Coelho 2014-10-08 09:48:39 +03:00 committed by Johannes Berg
parent f1d65583bc
commit 0c21e6320f
3 changed files with 42 additions and 19 deletions
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2
net/mac80211/ieee80211_i.h
View File

@ -434,6 +434,8 @@ struct ieee80211_if_managed {
unsigned int flags;
bool csa_waiting_bcn;
bool beacon_crc_valid;
u32 beacon_crc;

2
net/mac80211/iface.c
View File

@ -842,6 +842,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
sdata_lock(sdata);
mutex_lock(&local->mtx);
sdata->vif.csa_active = false;
if (sdata->vif.type == NL80211_IFTYPE_STATION)
sdata->u.mgd.csa_waiting_bcn = false;
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);

57
net/mac80211/mlme.c
View File

@ -1001,23 +1001,7 @@ static void ieee80211_chswitch_work(struct work_struct *work)
/* XXX: shouldn't really modify cfg80211-owned data! */
ifmgd->associated->channel = sdata->csa_chandef.chan;
sdata->vif.csa_active = false;
/* XXX: wait for a beacon first? */
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
ret = drv_post_channel_switch(sdata);
if (ret) {
sdata_info(sdata,
"driver post channel switch failed, disconnecting\n");
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
goto out;
}
ifmgd->csa_waiting_bcn = true;
ieee80211_sta_reset_beacon_monitor(sdata);
ieee80211_sta_reset_conn_monitor(sdata);
@ -1028,6 +1012,35 @@ out:
sdata_unlock(sdata);
}
static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
int ret;
sdata_assert_lock(sdata);
WARN_ON(!sdata->vif.csa_active);
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
ret = drv_post_channel_switch(sdata);
if (ret) {
sdata_info(sdata,
"driver post channel switch failed, disconnecting\n");
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
return;
}
}
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
@ -1943,6 +1956,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
ieee80211_vif_release_channel(sdata);
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
@ -2191,6 +2205,7 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
true, frame_buf);
mutex_lock(&local->mtx);
sdata->vif.csa_active = false;
ifmgd->csa_waiting_bcn = false;
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
@ -3215,6 +3230,9 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
}
}
if (ifmgd->csa_waiting_bcn)
ieee80211_chswitch_post_beacon(sdata);
if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
return;
ifmgd->beacon_crc = ncrc;
@ -3687,11 +3705,12 @@ static void ieee80211_sta_bcn_mon_timer(unsigned long data)
struct ieee80211_sub_if_data *sdata =
(struct ieee80211_sub_if_data *) data;
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
if (local->quiescing)
return;
if (sdata->vif.csa_active)
if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
return;
sdata->u.mgd.connection_loss = false;
@ -3709,7 +3728,7 @@ static void ieee80211_sta_conn_mon_timer(unsigned long data)
if (local->quiescing)
return;
if (sdata->vif.csa_active)
if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
return;
ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);