iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iwlwifi: mvm: Handle failed beacon transmissions during CSA

Browse Source 
The spec requires to decrement the CSA counters based on TBTT,
regardless if the beacon was actually transmitted. Previously, the fw
would send beacon notifications only for successfully transmitted
beacons. This behavior resulted in inaccurate CSA countdown. In order
to address this issue, the fw was changed to send beacon
notifications also for not transmitted beacons. Such notifications
have TX_STATUS_INTERNAL_ABORT (0x92).
Don't start the CSA countdown before first successfully transmitted
beacon, in order to guarantee that the CSA is announced for a
required period.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
This commit is contained in:
Andrei Otcheretianski 2014-11-10 11:10:11 +02:00 committed by Emmanuel Grumbach
parent 6fd1fb63ab
commit 7ef0aab66b
3 changed files with 29 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c
View File

@ -1263,17 +1263,25 @@ int iwl_mvm_mac_ctxt_remove(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
}
static void iwl_mvm_csa_count_down(struct iwl_mvm *mvm,
struct ieee80211_vif *csa_vif, u32 gp2)
struct ieee80211_vif *csa_vif, u32 gp2,
bool tx_success)
{
struct iwl_mvm_vif *mvmvif =
iwl_mvm_vif_from_mac80211(csa_vif);
/* Don't start to countdown from a failed beacon */
if (!tx_success && !mvmvif->csa_countdown)
return;
mvmvif->csa_countdown = true;
if (!ieee80211_csa_is_complete(csa_vif)) {
int c = ieee80211_csa_update_counter(csa_vif);
iwl_mvm_mac_ctxt_beacon_changed(mvm, csa_vif);
if (csa_vif->p2p &&
!iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2) {
!iwl_mvm_te_scheduled(&mvmvif->time_event_data) && gp2 &&
tx_success) {
u32 rel_time = (c + 1) *
csa_vif->bss_conf.beacon_int -
IWL_MVM_CHANNEL_SWITCH_TIME_GO;
@ -1300,6 +1308,7 @@ int iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
struct ieee80211_vif *csa_vif;
struct ieee80211_vif *tx_blocked_vif;
u64 tsf;
u16 status;
lockdep_assert_held(&mvm->mutex);
@ -1316,18 +1325,18 @@ int iwl_mvm_rx_beacon_notif(struct iwl_mvm *mvm,
tsf = le64_to_cpu(beacon->tsf);
}
status = le16_to_cpu(beacon_notify_hdr->status.status) & TX_STATUS_MSK;
IWL_DEBUG_RX(mvm,
"beacon status %#x retries:%d tsf:0x%16llX gp2:0x%X rate:%d\n",
le16_to_cpu(beacon_notify_hdr->status.status) &
TX_STATUS_MSK,
beacon_notify_hdr->failure_frame, tsf,
status, beacon_notify_hdr->failure_frame, tsf,
mvm->ap_last_beacon_gp2,
le32_to_cpu(beacon_notify_hdr->initial_rate));
csa_vif = rcu_dereference_protected(mvm->csa_vif,
lockdep_is_held(&mvm->mutex));
if (unlikely(csa_vif && csa_vif->csa_active))
iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2);
iwl_mvm_csa_count_down(mvm, csa_vif, mvm->ap_last_beacon_gp2,
(status == TX_STATUS_SUCCESS));
tx_blocked_vif = rcu_dereference_protected(mvm->csa_tx_blocked_vif,
lockdep_is_held(&mvm->mutex));

11
drivers/net/wireless/iwlwifi/mvm/mac80211.c
View File

@ -2909,6 +2909,8 @@ static void __iwl_mvm_unassign_vif_chanctx(struct iwl_mvm *mvm,
if (!vif->csa_active || !mvmvif->ap_ibss_active)
goto out;
mvmvif->csa_countdown = false;
/* Set CS bit on all the stations */
iwl_mvm_modify_all_sta_disable_tx(mvm, mvmvif, true);
@ -3164,6 +3166,7 @@ static int iwl_mvm_pre_channel_switch(struct ieee80211_hw *hw,
{
struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
struct ieee80211_vif *csa_vif;
struct iwl_mvm_vif *mvmvif;
int ret;
mutex_lock(&mvm->mutex);
@ -3183,6 +3186,14 @@ static int iwl_mvm_pre_channel_switch(struct ieee80211_hw *hw,
}
rcu_assign_pointer(mvm->csa_vif, vif);
mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (WARN_ONCE(mvmvif->csa_countdown,
"Previous CSA countdown didn't complete")) {
ret = -EBUSY;
goto out_unlock;
}
break;
default:
break;

3
drivers/net/wireless/iwlwifi/mvm/mvm.h
View File

@ -399,6 +399,9 @@ struct iwl_mvm_vif {
/* FW identified misbehaving AP */
u8 uapsd_misbehaving_bssid[ETH_ALEN];
/* Indicates that CSA countdown may be started */
bool csa_countdown;
};
static inline struct iwl_mvm_vif *