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iwlwifi: mvm: limit non-low-latency binding scheduling duration 

Limit the scheduling duration of bindings without a low-latency
interface in the firmware, this prevents those bindings from
occupying the medium for a period of time longer than what we
want for the other interfaces in low-latency mode.

As older firmware doesn't do anything with the max_duration field
and ignores it completely, there's no need for a firmware flag.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Johannes Berg 2013-11-12 22:18:45 +01:00 committed by Emmanuel Grumbach
parent 6ca40d6eae
commit 1fb184b4a4
2 changed files with 28 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/iwlwifi/mvm/constants.h
View File

@ -79,5 +79,7 @@
#define IWL_MVM_PS_SNOOZE_WINDOW 50
#define IWL_MVM_WOWLAN_PS_SNOOZE_WINDOW 25
#define IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT 64
#define IWL_MVM_LOWLAT_SINGLE_BINDING_MAXDUR 24 /* TU */
#define IWL_MVM_LOWLAT_DUAL_BINDING_MAXDUR 24 /* TU */
#endif /* __MVM_CONSTANTS_H */

33
drivers/net/wireless/iwlwifi/mvm/quota.c
View File

@ -180,6 +180,7 @@ int iwl_mvm_update_quotas(struct iwl_mvm *mvm, struct ieee80211_vif *newvif)
.colors = { -1, -1, -1, -1 },
.new_vif = newvif,
};
u32 ll_max_duration;
lockdep_assert_held(&mvm->mutex);
@ -198,6 +199,21 @@ int iwl_mvm_update_quotas(struct iwl_mvm *mvm, struct ieee80211_vif *newvif)
iwl_mvm_quota_iterator(&data, newvif->addr, newvif);
}
switch (data.n_low_latency_bindings) {
case 0: /* no low latency - use default */
ll_max_duration = 0;
break;
case 1: /* SingleBindingLowLatencyMode */
ll_max_duration = IWL_MVM_LOWLAT_SINGLE_BINDING_MAXDUR;
break;
case 2: /* DualBindingLowLatencyMode */
ll_max_duration = IWL_MVM_LOWLAT_DUAL_BINDING_MAXDUR;
break;
default: /* MultiBindingLowLatencyMode */
ll_max_duration = 0;
break;
}
/*
* The FW's scheduling session consists of
* IWL_MVM_MAX_QUOTA fragments. Divide these fragments
@ -242,18 +258,21 @@ int iwl_mvm_update_quotas(struct iwl_mvm *mvm, struct ieee80211_vif *newvif)
cmd.quotas[idx].id_and_color =
cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
if (data.n_interfaces[i] <= 0) {
if (data.n_interfaces[i] <= 0)
cmd.quotas[idx].quota = cpu_to_le32(0);
cmd.quotas[idx].max_duration = cpu_to_le32(0);
} else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
data.low_latency[i]) {
else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
data.low_latency[i])
cmd.quotas[idx].quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
cmd.quotas[idx].max_duration = cpu_to_le32(0);
} else {
else
cmd.quotas[idx].quota =
cpu_to_le32(quota * data.n_interfaces[i]);
if (data.n_interfaces[i] && !data.low_latency[i])
cmd.quotas[idx].max_duration =
cpu_to_le32(ll_max_duration);
else
cmd.quotas[idx].max_duration = cpu_to_le32(0);
}
idx++;
}