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iwlwifi: mvm: don't send identical PHY_CTXT_CMD 

When we have an AP which supports HT and a single HT
station is connected, we change the min_width from
NL80211_CHAN_WIDTH_20_NOHT to NL80211_CHAN_WIDTH_20. This
of course has no implication on the channel width but still
sends a command to the firmware.
Remember the last width that was sent and refrain from
sending unnecessary commands to the firmware.

Sending a PHY_CTXT_CMD to the firmware has a cost since it
recalculates the presence on the medium and because of that
it closes the transmit queues for a short while.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Emmanuel Grumbach 2017-09-14 15:45:44 +03:00 committed by Luca Coelho
parent a2ff48af65
commit 7a20bcceed
3 changed files with 17 additions and 0 deletions
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14
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
View File

@ -3406,10 +3406,24 @@ static void iwl_mvm_change_chanctx(struct ieee80211_hw *hw,
return;
mutex_lock(&mvm->mutex);
/* we are only changing the min_width, may be a noop */
if (changed == IEEE80211_CHANCTX_CHANGE_MIN_WIDTH) {
if (phy_ctxt->width == ctx->min_def.width)
goto out_unlock;
/* we are just toggling between 20_NOHT and 20 */
if (phy_ctxt->width <= NL80211_CHAN_WIDTH_20 &&
ctx->min_def.width <= NL80211_CHAN_WIDTH_20)
goto out_unlock;
}
iwl_mvm_bt_coex_vif_change(mvm);
iwl_mvm_phy_ctxt_changed(mvm, phy_ctxt, &ctx->min_def,
ctx->rx_chains_static,
ctx->rx_chains_dynamic);
out_unlock:
mutex_unlock(&mvm->mutex);
}

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

@ -147,6 +147,8 @@ struct iwl_mvm_phy_ctxt {
u16 color;
u32 ref;
enum nl80211_chan_width width;
/*
* TODO: This should probably be removed. Currently here only for rate
* scaling algorithm

1
drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
View File

@ -272,6 +272,7 @@ int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
}
ctxt->channel = chandef->chan;
ctxt->width = chandef->width;
return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
chains_static, chains_dynamic,
action, 0);