From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from paleale.coelho.fi ([176.9.41.70]:36152 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752177AbdI2Qoe (ORCPT ); Fri, 29 Sep 2017 12:44:34 -0400 From: Luca Coelho To: kvalo@codeaurora.org Cc: linux-wireless@vger.kernel.org, Emmanuel Grumbach , Luca Coelho Date: Fri, 29 Sep 2017 19:44:06 +0300 Message-Id: <20170929164423.23666-2-luca@coelho.fi> (sfid-20170929_200758_842169_5E9DECC0) In-Reply-To: <20170929164423.23666-1-luca@coelho.fi> References: <20170929164423.23666-1-luca@coelho.fi> Subject: [PATCH 01/18] iwlwifi: mvm: don't send identical PHY_CTXT_CMD Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Emmanuel Grumbach 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 Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 14 ++++++++++++++ drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 2 ++ drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c | 1 + 3 files changed, 17 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index d7530474c1d3..d6180463e92f 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -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); } diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index e8be5104b909..2867683f1aa0 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -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 diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c index 7ee8e9077baf..305cd56bf746 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c @@ -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); -- 2.14.1