Re: [PATCH 06/20] wifi: iwlwifi: mvm: handle TPE advertised by AP

Rory Little <rory@xxxxxxxxxxxxxxx> · Fri, 9 Aug 2024 11:25:27 -0700

Hi,

We noticed that our transmit throughput dropped by ~20-30% and bisected 
the issue to this patch. We will dig around a bit more to investigate 
why this seems to be happening...

- Rory

On 5/27/24 09:06, Miri Korenblit wrote:
From: Johannes Berg <johannes.berg@xxxxxxxxx>

6 GHz BSS SP client shall respect TX power limits advertised
by the AP in TPE elements, send the data to the firmware using
the AP_TX_POWER_CONSTRAINTS_CMD command, so do that.

Co-developed-by: Mukesh Sisodiya <mukesh.sisodiya@xxxxxxxxx>
Signed-off-by: Mukesh Sisodiya <mukesh.sisodiya@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@xxxxxxxxx>
---
  .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 11 ++++
  .../wireless/intel/iwlwifi/mvm/mld-mac80211.c | 55 ++++++++++++++++---
  drivers/net/wireless/intel/iwlwifi/mvm/mvm.h  |  6 ++
  3 files changed, 63 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 752fdb6a783f..88bc0baabf7e 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -2768,6 +2768,13 @@ iwl_mvm_bss_info_changed_station_common(struct iwl_mvm *mvm,
  
  	if (changes & BSS_CHANGED_BANDWIDTH)
  		iwl_mvm_update_link_smps(vif, link_conf);
+
+	if (changes & BSS_CHANGED_TPE) {
+		IWL_DEBUG_CALIB(mvm, "Changing TPE\n");
+		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
+							link_conf,
+							false);
+	}
  }
  
  static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
@@ -5122,6 +5129,10 @@ static int __iwl_mvm_assign_vif_chanctx(struct iwl_mvm *mvm,
  		}
  
  		iwl_mvm_update_quotas(mvm, false, NULL);
+
+		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
+							link_conf,
+							false);
  	}
  
  	goto out;
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
index 00433d1c8564..b2b6dbdcc44f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mld-mac80211.c
@@ -345,6 +345,11 @@ __iwl_mvm_mld_assign_vif_chanctx(struct iwl_mvm *mvm,
  		rcu_read_unlock();
  	}
  
+	if (vif->type == NL80211_IFTYPE_STATION)
+		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
+							link_conf,
+							false);
+
  	/* then activate */
  	ret = iwl_mvm_link_changed(mvm, vif, link_conf,
  				   LINK_CONTEXT_MODIFY_ACTIVE |
@@ -524,9 +529,37 @@ static void iwl_mvm_mld_unassign_vif_chanctx(struct ieee80211_hw *hw,
  }
  
  static void
+iwl_mvm_tpe_sta_cmd_data(struct iwl_txpower_constraints_cmd *cmd,
+			 const struct ieee80211_bss_conf *bss_info)
+{
+	u8 i;
+
+	/*
+	 * NOTE: the 0 here is IEEE80211_TPE_CAT_6GHZ_DEFAULT,
+	 * we fully ignore IEEE80211_TPE_CAT_6GHZ_SUBORDINATE
+	 */
+
+	BUILD_BUG_ON(ARRAY_SIZE(cmd->psd_pwr) !=
+		     ARRAY_SIZE(bss_info->tpe.psd_local[0].power));
+
+	/* if not valid, mac80211 puts default (max value) */
+	for (i = 0; i < ARRAY_SIZE(cmd->psd_pwr); i++)
+		cmd->psd_pwr[i] = min(bss_info->tpe.psd_local[0].power[i],
+				      bss_info->tpe.psd_reg_client[0].power[i]);
+
+	BUILD_BUG_ON(ARRAY_SIZE(cmd->eirp_pwr) !=
+		     ARRAY_SIZE(bss_info->tpe.max_local[0].power));
+
+	for (i = 0; i < ARRAY_SIZE(cmd->eirp_pwr); i++)
+		cmd->eirp_pwr[i] = min(bss_info->tpe.max_local[0].power[i],
+				       bss_info->tpe.max_reg_client[0].power[i]);
+}
+
+void
  iwl_mvm_send_ap_tx_power_constraint_cmd(struct iwl_mvm *mvm,
  					struct ieee80211_vif *vif,
-					struct ieee80211_bss_conf *bss_conf)
+					struct ieee80211_bss_conf *bss_conf,
+					bool is_ap)
  {
  	struct iwl_txpower_constraints_cmd cmd = {};
  	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
@@ -546,19 +579,22 @@ iwl_mvm_send_ap_tx_power_constraint_cmd(struct iwl_mvm *mvm,
  	    link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID)
  		return;
  
-	if (bss_conf->chanreq.oper.chan->band != NL80211_BAND_6GHZ ||
-	    bss_conf->chanreq.oper.chan->flags &
-		    IEEE80211_CHAN_NO_6GHZ_VLP_CLIENT)
+	if (bss_conf->chanreq.oper.chan->band != NL80211_BAND_6GHZ)
  		return;
  
  	cmd.link_id = cpu_to_le16(link_info->fw_link_id);
-	/*
-	 * Currently supporting VLP Soft AP only.
-	 */
-	cmd.ap_type = cpu_to_le16(IWL_6GHZ_AP_TYPE_VLP);
  	memset(cmd.psd_pwr, DEFAULT_TPE_TX_POWER, sizeof(cmd.psd_pwr));
  	memset(cmd.eirp_pwr, DEFAULT_TPE_TX_POWER, sizeof(cmd.eirp_pwr));
  
+	if (is_ap) {
+		cmd.ap_type = cpu_to_le16(IWL_6GHZ_AP_TYPE_VLP);
+	} else if (bss_conf->power_type == IEEE80211_REG_UNSET_AP) {
+		return;
+	} else {
+		cmd.ap_type = cpu_to_le16(bss_conf->power_type - 1);
+		iwl_mvm_tpe_sta_cmd_data(&cmd, bss_conf);
+	}
+
  	ret = iwl_mvm_send_cmd_pdu(mvm,
  				   WIDE_ID(PHY_OPS_GROUP,
  					   AP_TX_POWER_CONSTRAINTS_CMD),
@@ -580,7 +616,8 @@ static int iwl_mvm_mld_start_ap_ibss(struct ieee80211_hw *hw,
  	guard(mvm)(mvm);
  
  	if (vif->type == NL80211_IFTYPE_AP)
-		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif, link_conf);
+		iwl_mvm_send_ap_tx_power_constraint_cmd(mvm, vif,
+							link_conf, true);
  
  	/* Send the beacon template */
  	ret = iwl_mvm_mac_ctxt_beacon_changed(mvm, vif, link_conf);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index f3d9b8355c6b..9b939225990a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -2962,4 +2962,10 @@ iwl_mvm_bt_coex_calculate_esr_mode(struct iwl_mvm *mvm,
  				   bool primary);
  int iwl_mvm_esr_non_bss_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  			     unsigned int link_id, bool active);
+
+void
+iwl_mvm_send_ap_tx_power_constraint_cmd(struct iwl_mvm *mvm,
+					struct ieee80211_vif *vif,
+					struct ieee80211_bss_conf *bss_conf,
+					bool is_ap);
  #endif /* __IWL_MVM_H__ */







