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iwlwifi: mvm: Disable uAPSD for a DCM client 

A binding object associates virtual MACs to a Phy.
Binding object can ask (and get) air time, thus
allowing several MACs to share the medium.
A binding object can be in either one of 3 states:
1) standalone - A single active MAC
2) Different Channel Mode (DCM) - There are 2 active
   MACs or more (not necessarily just clients), but each
   has its own channel.
3) Same Channel Mode (SCM) - There are 2 active
   MACs or more (not necessarily just clients), that
   share the same channel.
This patch introduces an additional condition for enabling uAPSD:
uAPSD should be disabled for a client in DCM.
The reason for that is a low latency issue in Miracast.

Signed-off-by: Avri Altman <avri.altman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Avri Altman 2014-05-08 10:06:01 +03:00 committed by Emmanuel Grumbach
parent 63ef81cfb6
commit 0534528ec3
1 changed files with 27 additions and 0 deletions
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27
drivers/net/wireless/iwlwifi/mvm/power.c
View File

@ -268,10 +268,30 @@ static void iwl_mvm_power_configure_uapsd(struct iwl_mvm *mvm,
IWL_MVM_PS_HEAVY_RX_THLD_PERCENT;
}
static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
struct ieee80211_vif *vif)
{
unsigned long *data = _data;
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
if (!mvmvif->phy_ctxt)
return;
if (vif->type == NL80211_IFTYPE_STATION ||
vif->type == NL80211_IFTYPE_AP)
__set_bit(mvmvif->phy_ctxt->id, data);
}
static bool iwl_mvm_power_allow_uapsd(struct iwl_mvm *mvm,
struct ieee80211_vif *vif)
{
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
unsigned long phy_ctxt_counter = 0;
ieee80211_iterate_active_interfaces_atomic(mvm->hw,
IEEE80211_IFACE_ITER_NORMAL,
iwl_mvm_binding_iterator,
&phy_ctxt_counter);
if (!memcmp(mvmvif->uapsd_misbehaving_bssid, vif->bss_conf.bssid,
ETH_ALEN))
@ -289,6 +309,13 @@ static bool iwl_mvm_power_allow_uapsd(struct iwl_mvm *mvm,
IEEE80211_P2P_OPPPS_ENABLE_BIT))
return false;
/*
* Avoid using uAPSD if client is in DCM -
* low latency issue in Miracast
*/
if (hweight8(phy_ctxt_counter) >= 2)
return false;
return true;
}