iwlwifi: add module parameter to disable 802.11ax

Add a module parameter to disable 802.11ax features in supported
devices.  This is useful for testing or if there are interoperability
issues with some APs.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -1856,3 +1856,7 @@ module_param_named(remove_when_gone,
 		   0444);
 MODULE_PARM_DESC(remove_when_gone,
 		 "Remove dev from PCIe bus if it is deemed inaccessible (default: false)");
+
+module_param_named(disable_11ax, iwlwifi_mod_params.disable_11ax, bool,
+		   S_IRUGO);
+MODULE_PARM_DESC(disable_11ax, "Disable HE capabilities (default: false)");

drivers/net/wireless/intel/iwlwifi/iwl-modparams.h

@@ -144,6 +144,10 @@ struct iwl_mod_params {
 	bool lar_disable;
 	bool fw_monitor;
 	bool disable_11ac;
+	/**
+	 * @disable_11ax: disable HE capabilities, default = false
+	 */
+	bool disable_11ax;
 	bool remove_when_gone;
 };
 

drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c

@@ -578,7 +578,7 @@ static void iwl_init_sbands(struct device *dev, const struct iwl_cfg *cfg,
 	iwl_init_ht_hw_capab(cfg, data, &sband->ht_cap, NL80211_BAND_2GHZ,
 			     tx_chains, rx_chains);
 
-	if (data->sku_cap_11ax_enable)
+	if (data->sku_cap_11ax_enable && !iwlwifi_mod_params.disable_11ax)
 		iwl_init_he_hw_capab(sband, tx_chains, rx_chains);
 
 	sband = &data->bands[NL80211_BAND_5GHZ];
@@ -593,7 +593,7 @@ static void iwl_init_sbands(struct device *dev, const struct iwl_cfg *cfg,
 		iwl_init_vht_hw_capab(cfg, data, &sband->vht_cap,
 				      tx_chains, rx_chains);
 
-	if (data->sku_cap_11ax_enable)
+	if (data->sku_cap_11ax_enable && !iwlwifi_mod_params.disable_11ax)
 		iwl_init_he_hw_capab(sband, tx_chains, rx_chains);
 
 	if (n_channels != n_used)

drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c

@@ -780,7 +780,8 @@ static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 	if (vif->probe_req_reg && vif->bss_conf.assoc && vif->p2p)
 		cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST);
 
-	if (vif->bss_conf.assoc && vif->bss_conf.he_support)
+	if (vif->bss_conf.assoc && vif->bss_conf.he_support &&
+	    !iwlwifi_mod_params.disable_11ax)
 		cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_11AX);
 
 	return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd);

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -2100,7 +2100,8 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 	 * added.
 	 */
 	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
-		if (vif->bss_conf.he_support)
+		if (vif->bss_conf.he_support &&
+		    !iwlwifi_mod_params.disable_11ax)
 			iwl_mvm_cfg_he_sta(mvm, vif, mvmvif->ap_sta_id);
 
 		iwl_mvm_mac_ctxt_recalc_tsf_id(mvm, vif);